What Did Norman Triplett Observe When He Asked Children to Wind

What did Norman Triplett observe when he asked children to wind a string as fast as they could while alone and also in the presence of other children?

A) The children wound the string faster when they were in the presence of other children
B) The children wound the string faster when they were alone
C) The children found the task too difficult to complete
D) Only a few of the children were affected by the presence of other children