The u. s. evacuated vietnamese . who spoke english as a second languageb. who had family already in the united statesc. whose lives were at risk if they stayed behindd. who were wounded or in need of medical care

whose lives were at risk if they stayed behind.

Explanation:

By 1974, it became certain that the Republic of Vietnam would fall. Thousand of southern Vietnamese were escaping by sea and air. The Northern Vietnamese troops were at the border of the southern capital of Saigon by April 1975. The President of the United States gave order for the evacuation of U.S civilians and the Vietnamese who were at risk. Around seven thousand people were evacuated by airlifts in the final phase of evacuation called Operation Frequent wind.

increases in demand are shown by a shift to the right in the demand curve. this could be caused by a number of factors, including a rise in income, a rise in the price of a substitute or a fall in the price of a complement.

which the answer is:

b