What was the most common argument used by the US presidents of the 1960s and 1970s favoring military involvement in Vietnam? A.
They argued that they wanted to stop the Vietnamese effort to create a democratic nation.
B.
They claimed that the South Vietnamese were invading North Vietnam illegally, which warranted US involvement.
C.
They claimed the US must fight in the Vietnam War to stop the potential spread of communism.
D.
They argued that they wanted to assert executive authority over legislative powers by entering the war.
its is C

C

Explanation:

That was the whole point of the cold war, and the Vietnam war by proxy

the answer is a) high entry costs

the caste system in india is the paradigmatic ethnographic example of caste. it has origins in ancient india, and was transformed by various ruling elites in medieval, early-modern, and modern india, especially the mughal empire and the british raj.it is today the basis of educational and job reservations in india.it consists of two different concepts, varna and jati, which may be regarded as different levels of analysis of this system.

the caste system as it exists today is thought to be the result of developments during the collapse of the mughal era and the british colonial regime in india. the collapse of the mughal era saw the rise of powerful men who associated themselves with kings, priests and ascetics, affirming the regal and martial form of the caste ideal, and it also reshaped many apparently casteless social groups into differentiated caste communities.the british raj furthered this development, making rigid caste organisation a central mechanism of administration

i didn’t fully understand your question but i hope this you !