Give long answer

Man becomes great not by his caste but by his heart

as people people are social human beings in a society. every person have differrent identity and culture such as rai, limbu, chetri and many more.they many own culture, traditions and religion. and according to my view man becomes great by heart not by his caste.

people of high caste and low caste are same people because we all are human beings. if a high caste people doesn't have good heart then it's no use because people admire those people who have good heart.but if low caste people have good heart and who helps people in need .then people obiviously admire him.people should be honest and reliable to everyone to remains in everyone's heart.

Explanation:

people in this world are no longer than brothers and sister. people used to discriminate eachother on the basis of their castes but they don't know how people think about him. although those people respect him but in their heart they have no space to remain in their heart. so what's the use of high and low caste if the people donot admire you. if you have good heart then you will be admire by everyone.

the telephone is the answer

i am pretty sure it is d.