We need to select the most appropriate adverb to complete the sentence.
Step 1: Understand the context.
The sentence describes someone waiting for their mother. The emotion typically associated with waiting for someone, especially a mother, is anxiety, worry, or nervousness.
Step 2: Evaluate each option.
- (A) carefully — Means with caution or attention. This does not fit the emotion of waiting. Incorrect.
- (B) anxiously — Means feeling worried, nervous, or uneasy. This perfectly describes the state of someone waiting for their mother. Correct.
- (C) uneriously — This is not a standard English word. It might be a misspelling of "seriously" but even "seriously" would not fit well here. Incorrect.
- (D) irritatingly — Means in a way that causes annoyance. This describes how someone else might find the waiting, not how the person is waiting. Incorrect.
Step 3: Conclusion.
"Anxiously" is the most suitable adverb to describe waiting for one's mother.
Final Answer: (B) anxiously