Answer from cs61c-aq (Anjali Jagannatha Koppal 16454392) for Question 1
All three are true.

a. if there is a block available with more than sufficient memory, malloc will reduce the number of free blocks.

if not, the compiler demands more memory from the OS. this may result in an increase in the number of free blocks, or in a rare care, no change in the number of free blocks.