Why did the young boys not believe Emmett Till when he showed them a picture of a white girl?

found this on a wiki hope it helps. Emmett Louis Till (July 25, 1941 – August 28, 1955) was a 14-year-old African American who was lynched in Mississippi in 1955, after being accused of offending a white woman in her family's grocery store. The brutality of his murder and the fact that his killers were acquitted drew attention to the long history of violent persecution of African Americans in the United States. Till posthumously became an icon of the civil rights movement.[1]

Till was born and raised in Chicago, Illinois. During summer vacation in August 1955, he was visiting relatives near Money, in the Mississippi Delta region. He spoke to 21-year-old Carolyn Bryant, the white married proprietor of a small grocery store there. Although what happened at the store is a matter of dispute, Till was accused of flirting with or whistling at Bryant. In 1955, Bryant had testified that Till made physical and verbal advances. The jury did not hear Bryant's testimony, due to the judge ruling it inadmissible.[2][3] Decades later, historian Timothy Tyson interviewed Bryant and wrote a book in which he claimed that she had disclosed that she had fabricated part of the testimony regarding her interaction with Till, specifically the portion where she accused Till of grabbing her waist and uttering obscenities; "That part's not true," Tyson claimed that Bryant stated in a 2008 interview with him.[2][4][5] Till's interaction with Bryant, perhaps unwittingly if at all, violated the strictures of conduct for an African-American male interacting with a white woman in the Jim Crow-era South.[6] Several nights after the incident in the store, Bryant's husband Roy and his half-brother J.W. Milam were armed when they went to Till's great-uncle's house and abducted the boy. They took him away and beat and mutilated him before shooting him in the head and sinking his body in the Tallahatchie River. Three days later, Till's body was discovered and retrieved from the river.

Explanation:

the answer is choice (b)

question as stated in comment

why did the chinese require the portuguese to pay for goods in gold and silver when trading?

choices

portuguese goods were less valuable than chinese goods.

the chinese already had a surplus of portuguese goods.

the imperial government wanted to stockpile gold and silver.

portuguese and chinese currencies were not exchangeable.

this a history q n in ancient time, theres no money exchange. so ans is portuguese and chinese currencies were not exchangeable.