Muslims believe the black stone in the Ka'bah was sent as a sign from
A. Abraham
B. İsaac
C. God
D. Gabriel

C. God

Explanation:

Islamic tradition holds that the Black Stone fell from Jannah to show Adam and Eve where to build an altar, which became the first temple on Earth. Muslims believe that the stone was originally pure and dazzling white, but has since turned black because of the sins of the people who touch it.

So It was sent down from heavens which Allah sent it down to the ground

these conditions long with a short growing season made farming difficult.

explanation:

the north has a climate of warm summers and snowy cold winters. the terrain is rocky, hilly, and not good for farming.

a. because the u.s. was the leading with the most technology, economy, etc. also was teamed with other allies witch boosted the economy and materials to improve technology and use it.