Which description of adam smith is correct?

a.
builder of britain's first canals

b.
political philosopher who inspire the american revolution

c.

author of das kapital and founder of communism

d.

author of the wealth of nations and "father of modern economics"

D is the correct. He was a famous economist and yes, he wrote The Wealth of Nations. 

B. Olaudah Equiano

He was known for most of his life as a writer and abolitionist but also a slave. He bought his freedom and wrote compellingly about his experiences and was an extraordinary man who became a prominent figure associated with the campaign to abolish the slave trade.