What is a difference between the rise to power of the kingdom of ghana and that of the umayyad empire? (see attachment for the choices)

B. The Kingdom of Ghana became powerful by taxing gold merchants who passed through its lands. In contrast, the Umayyad Empire extended its power through campaigns of conquest by Islamic armies is the correct answer.

i think it's b

the border between arizona and new mexico is a thin, black line; this indicates a state boundary.

its correct: it's a thin line, and it's a state boundary, correct