Emma _____ Graham when she was going out with his friend.
Choose the correct alternative to complete the sentence.

The correct answer is Option C (met).

Key Points:
• When an ongoing longer action in the past continuous tense ('when she was going out...') is intersected by a completed momentary single action, the intersecting action takes the Simple Past tense (met).
• Option 3 (met).
• 'Emma met Graham when she was going out with his friend.' The completed single event in the past requires the past simple form 'met'.
• Key Takeaway: An event that interrupts a past continuous action takes the simple past tense (met).