Question

Find the word that is an essential part of the given word : knowledge
a. school
b. teacher
c. textbook
d. learning

Answer 1

d.learning
Doesn't mean mugging up but yeah u need to learn I increase your knowledge
Just like you should learn from your mistakes.

Answer 2

Option D i.e Learning is the correct answer.

Knowledge is actually an understanding or awareness (information) acquired by an individual through experience or study. So learning is an essential element of knowledge as learning itself is the process of acquiring new information (knowledge) or skill etc or modifying the existing one.

A school, teacher and textbook is not necessary for knowledge or learning. One can learn or gain knowledge without these things.