Hi,
I do not know the test could be that tough!
Between A and B, I would select A for the reason that we often hear,
"How many dependents do you have?"Here is an extract from The American Heritage Dictionary:
"SYNONYMS
rely, trust, depend, reckon. These verbs share the meaning to place or have faith or confidence in someone or something.
Rely implies complete confidence:
“You are the only woman I can rely on to be interested in her” (John Galsworthy).
Trust stresses confidence arising from belief that is often based on inconclusive evidence:
“We must try to trust one another. Stay and cooperate” (Jomo Kenyatta).
Depend implies confidence in the help or support of another:
depends on friends for emotional support.
Reckon implies a sense of confident expectancy:
“He reckons on finding a woman as big a fool as himself” (George Meredith)."