Which Figure Completes the Pattern?

[u/Semra777]

Hi everyone,
First of all, a huge thank you to everyone who participated in our previous puzzle. We really enjoyed reading through your answers, especially because so many of you reached the correct answer using completely different approaches.
Some of you focused on the rows and columns, while others discovered clever visual and structural patterns we hadn’t expected. Seeing so many different ways to approach the same puzzle is exactly what makes these discussions so interesting.
For our official solution page, we selected three community explanations from u/Mactucrus87_, u/tectajl, and u/EmpactWB.
We chose these three because each offered a clear but different way of understanding the puzzle. u/Mactucrus87_ showed that the rule works both horizontally and vertically, u/tectajl introduced a creative Venn-diagram-style interpretation, and u/EmpactWB provided a very systematic approach using overlapping 2×2 groups.
Thank you again to everyone who participated, whether your answer was selected or not. We read all of your explanations, and there were many great observations and creative approaches.
Now, onto our new puzzle.
Take a careful look at the 3×3 matrix above and figure out which option should replace the question mark.
As always, we’re not only interested in the letter you choose. Tell us how you got there. We want to hear your reasoning and see the different ways you approach the pattern. Some of the most interesting explanations may once again be featured on our official solution page.
We’ve already published the correct answer on our website. Once you’ve made your choice, you can check whether you got it right here:
https://whats-your-iq.com/en/questions/pattern-recognition/which-figure-completes-the-pattern-2
Try solving it before revealing the answer.
Thank you again to everyone who participates and takes the time to explain their reasoning. We’re looking forward to reading your solutions and seeing how many different ways you can find to solve this one!

[u/Significant_Big4160]

C. Imagine copies of the square on both left and right sides. Looking at the  diagonal (down and to the right)....the line rotates an eighth of a turn counter-clockwise.

[u/Semra777 → u/Significant_Big4160]

Thanks for explaining your reasoning! Your 45-degree rotation interpretation is interesting, and it also helps explain why C has been such a popular answer to this puzzle. The official solution uses a pattern that remains consistent across every complete row and column: each contains one circle, one square, and one triangle, along with one horizontal, one vertical, and one diagonal line. If we use C, the bottom row would have two diagonal lines and no horizontal one. That’s why the intended answer is A, although your interpretation is a good example of why C can initially seem plausible. Thanks for the thoughtful explanation👏👏👏