Which of the following is an example of a modification ? A.a Living near an oasis in the Sahara Desert
B.Building the Suez Canal
C. Using air conditioning in Cairo, Egypt
D. increasing government control over the environment

a

Explanation:

I guessed so i don't know but I think it's the right answer

Based on Passage 1, slavery was the reason why socio-economic progress for African Americans has been slow.

During the 17th and 18th centuries, slavery was rampant throughout American colonies. Through the manufacture of lucrative crops like cotton and tobacco, the African slaves helped establish the new nation into a powerhouse of economy.

African Americans climbed into the upper middle class in large numbers during the 1980s.