Choose the correct sentence which is built from the words and phrases given:
In 1900 / Einstein / become / teacher / mathematics and physics.
A. In 1900, Einstein has become a teacher of mathematics and physics.
B. In 1900 and then Einstein became a teacher of mathematics and physics.
C. In 1900, Einstein became a teacher of mathematics and physics.
D. In 1900 Einstein becomes a teacher of mathematics and physics.