Jeremy's Car Has Broken Down in the Middle of an Intersection

Multiple Choice

Jeremy's car has broken down in the middle of an intersection. He begins to push it out of the way on his own. After a minute, four people come over and help him push. What is likely to happen to his pushing effort when the others are helping compared to when he was alone?

A) He pushes harder.
B) He pushes the same.
C) He pushes less hard.
D) He stops pushing all together and steps back to watch.