4 Her alarm went ..... at 8 am.

Step 1: Consider the common phrasal verb for an alarm. Alarms typically 'go off' when they activate.
Step 2: Examine the options provided. Option B, 'out', is the correct part of the phrasal verb 'go off'.
Step 3: Confirm the meaning. 'Went out' in this context means the alarm sounded.
Answer: out