The three principle religions in asia were

The three principal religions in Asia were Buddhism, Hinduism, and Taoism.

1) Buddhism- This is a salvational religion that created around 528 B.C.E. in northern India. The religion was founded by Siddharta Gautama (563-483 B.C.E.), whom his supporters later called the Buddha (the Enlightened One).

2) Hinduism- the genesis of Hinduism can be traced back to the third millennium B.C.E. around 1500 B.C.E. from nomadic Aryan people entered northwestern India from Persia.

3)Taoism- This religion is considered a folk religion and a philosophy which can be regarded as China's original religion. The religion was founded in the 6th century B.C.E. by Lao Tzu, the putative author of the classic text Tao Te Ching. Taoism has no deity. "Tao" means "way," for example the cosmic order of the polar forces yin (female) and yang (male). The religion is viewed as a universal principle that's not accessible through mere human reason.

yup! you are correct it is b.

because the vietnam war was fought in an especially brutal and untraditional way