5 She ..... me at 6 pm yesterday.

Step 1: Analyze the sentence for tense and context. The phrase 'at 6 pm yesterday' indicates a completed action in the past.
Step 2: Choose the verb form that denotes a single, completed past action. The simple past tense is required.
Step 3: Compare the options. Option A, 'called', is the simple past tense. Option B, 'calling', is the present participle and requires an auxiliary verb. Option C, 'call', is the base form.
Answer: called