Answer from cs61c-au (Robert Webb 14343043) for Question 2
B and C are true.

B is true because if the released memory is contiguous with one other memory block, they will be combined and the number of blocks will not change.

C is true because if the released memory is contiguous with two other memory blocks, one above and below, then the three blocks will be combined into a single large block.  Then if there are two free blocks and the released memory is between them, there will be one free block in the end.  This results in one free block, so the total goes down by 1.

If the release memory is not contiguous, then it will be added as a new block, but this will not ALWAYS happen.