Select the option that expresses the given sentence in indirect speech.
My friend Ganesh said, “I could solve the biggest problem very easily.”

Correct option is D

The correct indirect speech is (d) My friend Ganesh said that he could solve the biggest problem very easily.
Direct Speech: When the exact words of the speaker are quoted using quotation marks, it is called direct speech.
Indirect Speech: When the speaker’s words are reported without quoting them exactly, it is called indirect speech.
Explanation:
· Since the reporting verb ("said") is in the past tense, the tense of the reported clause may remain unchanged if it already uses a past modal like “could.”
· No changes are needed in the modal “could” here.
Grammatical Rule:
· In indirect speech, "could" generally remains unchanged.
· Example: He said, “I could win.” → He said that he could win.