The definition of communal is "Shared by all members of a community; for common use."
I would say that their kitchen <em>is</em> communal because their "community" consists of all the roommates who use the kitchen and contribute to it. If only one person contributed to the kitchen stock, then it would not be communal.
I think it is D.
'It' makes the sentence unclear in purpose
Answer: Kane is mean to Loretta and doesn't like her. For example, he will not eat anything that she touches.