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 ?
Option 0: He laughed .
Option 1: He ignored them .
Option 2: He smiled .
Option 3: He pretended to be on the phone .
Answer: 2