Not sure i think it’s (a) furniture ... because maybe the furniture includes infrastructure?! hope i helped :(.
The correct answer should be A. Whomever.
This is because this can be paraphrased as "the instructor has picked him" not "the instructor has picked he". Him corresponds to whomever while he corresponds to whoever.
My opinion would be 2 1/2 cups of dry dog food in 1 day.
A. is the answer is about companionship