David said to Anna, "Mona will leave for her native place tomorrow."

Original Sentence (Direct Speech):
David said to Anna, "Mona will leave for her native place tomorrow."

Step-by-step Conversion:
1. Change it into indirect speech using “told Anna that” (since “said to” changes to “told” in indirect speech).
2. The verb “will leave” is in future tense. In indirect speech, simple future “will” changes to “would”. So, it becomes “would leave”.
3. The time word “tomorrow” changes to “the next day” in indirect speech.

Correct Sentence:
David told Anna that Mona would leave for her native place the next day.

Correct Answer: Option D

Why other options are incorrect:
Option A: “will leave” — ❌ wrong tense; “will” should become “would” in indirect speech.
Option B: “left” — ❌ wrong tense; “will leave” should not change to past simple “left”.
Option C: “would be leaving” — ❌ incorrect form; original tense is simple future, so we use “would leave”, not continuous.

Final Answer: Option D – David told Anna that Mona would leave for her native place the next day.