💡 Explanation:
✅ Correct Answer — D) must
🔎 Explanation
✔️ Must:
"Must" is used to express strong obligation, necessity, or urgency, especially when immediate action is required.
In this sentence, the seriousness of the situation ("mother is seriously ill") makes "must" the most forceful and appropriate choice.
🔖 “Must” shows that there is no choice — the action is compulsory.
Might:
Shows possibility, not obligation. It is weak and uncertain, which doesn't match the urgency of the situation.
Could:
Used to express Past ability or suggestion,
Thank you! From now on, I’ll include "Question [number]" right after the ❓ as you specified.
