Which of the following can be the best title for this passage

A．Because she was seven years old.
B．Because she was the first to come to the zoo.
C．Because she learned a lot from the goat and the chickens.
D．Because she had no elephant partners to play with.

A．Because the surface of Mars seemed to be geometric.
B．Because the lines were drawn across the surface of the planet.
C．Because a system of canals was thought to be there.
D．Because it was the Martians that built the canals.