Context: Stepping off the bus , a familiar face caught my attention . I was n't sure if he 'd remember me , but seconds later I figured . He did . It 's been two years now since we stayed in Weir House .

Question: What may be the reason why they knew he recognized them ?
Options:
0. He laughed .
1. He ignored them .
2. He smiled .
3. He pretended to be on the phone .
Answer: 2