I disagree with that. Schizoid behavior usually includes a lack of any social interest. If he has a girlfriend, then that's sort of pointing to a no for that. Though one can say "Well, situationally.." but since this is a textbook question, one can assume specifically pointing out social interaction means it's not SPD. Obsessive-Compulsive traits however don't always have to do with repetition. (Though because he obviously studies vigorously and repetitively looks at lab specimens, there is actual repetition. Just not to the point of OCD(isorder)) OC TRAITS usually have to do more with perfection, structure, and mental and physical order.

TL;DR- I think it's C.

Actually, SPD is feeling apathy towards people and not showing interest in any relationships, It clearly states that he has a girlfriend.

So the answer is actually C

...On another note, anyone have any idea why I got thumbed down for this?

I loved sisterhood, try bloodlines, scar tissue and class of 2017 (scar tissue and class of 2017 are part of the same story and there is also another one where Hanako does the thing that she said she would do for Lilly and Hisao and is then absent in that fanfiction, you will have to find that by yourself sorry.
Also check out scissorlips' Suzu route and misstep that is a well written story by Doomish but still questionable.

Hahaha same here, I have probably spent more, I think there isn't a fanfiction there that I haven't read.

I look forward to read the one posted in the link, though I have to say my favorites are Clarity, Sisterhood, and Reconciliation.

I loved sisterhood, try bloodlines, scar tissue and class of 2017 (scar tissue and class of 2017 are part of the same story and there is also another one where Hanako does the thing that she said she would do for Lilly and Hisao and is then absent in that fanfiction, you will have to find that by yourself sorry.
Also check out scissorlips' Suzu route and misstep that is a well written story by Doomish but still questionable.

Well done!

And what were your findings?

I didn't see what you did there

Well done!