Correct option is C
Statement:
Vikansh could not solve his math problem today because Gavaskar is absent from school.
Analysis of Assumptions:
Assumption L:
"Usually, Vikansh can solve his math problems himself."
"Usually, Vikansh can solve his math problems himself."
This assumption is not implicit because the statement directly attributes Vikansh's inability to solve the math problem to Gavaskar's absence. It suggests that Gavaskar's help is crucial, which implies that Vikansh may not usually solve math problems on his own. Hence, L is not implicit.
Assumption M:
"Usually, Gavaskar helps Vikansh solve his math problems."
"Usually, Gavaskar helps Vikansh solve his math problems."
This assumption is implicit because the statement explicitly links Vikansh's inability to solve the math problem with Gavaskar's absence. It strongly suggests that Gavaskar's help is a regular and important factor for Vikansh's success in solving math problems. Hence, M is implicit.
Thus, the correct option is (c) Only Assumption M is implicit.