Select the correct indirect form of the given sentence.
“You must work hard to succeed in your new venture”, said the mother to her son.

Correct option is D

The correct indirect speech is (d) The mother advised her son to work hard in order to succeed in his new venture.
Rules of Conversion:
· "Must" expressing advice becomes "advised".
· The phrase "to succeed" can be expanded as "in order to succeed" for better clarity.
Structure:
Direct: Said to + Object + "You must" →
Indirect: Advised + Object + to + base form (verb).
Example:
He said to me, "You must save money." → He advised me to save money.