Answer:
A) Yes, escrow accounts can be interest bearing if both parties agree.
Step-by-step explanation:
Usually escrow accounts are not interest bearing, mainly because the money is not held for a long time, at most a few months. The US Department of Housing and Urban Development (HUD) doesn't say anything about escrow funds being deposited in interest bearing accounts, but it doesn't prohibit it.
Therefore if both parties agree, then there should be no problem with it.