Select the option that expresses the given sentence in reported speech.
"Our teacher returned from Mumbai last month", she said.

Correct option is C

The correct indirect speech of the given sentence is (c) She said that their teacher had returned from Mumbai the previous month.
Explanation:
· The sentence is in direct speech, so we must convert it into indirect speech using the appropriate rules.
· Returned (simple past) becomes had returned (past perfect) when the reporting verb "said" is in the past tense.
· Time expression "last month" changes to "the previous month".
· "Our teacher" becomes "their teacher" because the speaker ("she") is not included in the listener’s group.
Rules Used:
• Past tense in direct speech → past perfect in indirect.
• Pronoun changes must reflect the speaker and listener's relationship.
• Time indicators change accordingly:
· Today → that day
· Yesterday → the day before
· Last month → the previous month
Example:
Direct: He said, “Our principal came last week.”
Indirect: He said that their principal had come the previous week.