How did Axum develop extensive trade networks?

a-by spreading Christianity through trade
b-by creating passages over the mountains and deserts
c-by conquering wealthy kingdoms and connecting trade routes
d-by widening roads to allow horse-drawn chariots to reach trade centers

c-by conquering wealthy kingdoms and connecting trade routes

Explanation:

Kingdom of Axum was a powerful state in Africa which was close to modern-day Ethiopia.

Axum conquered Kush by 350 CE and then became the political and economic power of the region.They also adopted Christianity around 325 CE under the powerful King Ezana as well and this helped in connecting it culturally to a growing number of Christian kingdoms.

C

Explanation:

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(b) britain had a much larger navy than the u.s.

(d) the u.s. had a small army compared to britain.