Lincoln thought he smelled smoke for a second. he looked at others in the classroom and at the teacher. no one seemed concerned, so lincoln continued taking his test along with his other classmates. this is most likely an example of

a. focused attention
b. a need for approval
c. conformational social influence
d. informational social influence

Informational social influence

Explanation:

Informational social influence is explained when we do not know anything and we try to copy to other people. They perform as an information source for how to behave. We people care about others what they think and then we follow or copy them. It is also called social proof.  

It occurs especially when:

So Lincoln that continued taking the test along with his other classmates.