If thread a and thread b are running, but not completing, which two could be occurring?

Given the fragment:

If thread a and thread b are running, but not completing, which two could be occurring?

A.
livelock

B.
deadlock

C.
starvation

D.
loose coupling

E.
cohesion

Explanation:
A:A thread often acts in response to the action of another thread. If the other thread’s action is also a response to the action of another thread, then livelock may result. A thread often acts in response to the action of another thread. If the other thread’s action is also a response to the action of another thread, then livelock may result.
B:Deadlock describes a situation where two or more threads are blocked forever, waiting for each other.