Isaac and Hailey set a wooden sailboat in a big puddle after a rainstorm. They sat on opposite sides of the boat, and on the count of three, they each began to blow as hard as they could on the sail of the boat. After a few seconds, the boat began to move toward Isaac. What happened?

A.
The force Isaac's breath exerted on the boat was stronger than Hailey's.
B.
The forces the two exerted on the boat with their breath were equal and in the same direction.
C.
The force Hailey's breath exerted on the boat was stronger than Isaac's.
D.
The forces the two exerted on the boat with their breath were equal and opposite.

B. The forces the two exerted on the boat with their breath were equal and in the same direction.