Question

Which sentence uses punctuation correctly? A. Since she is determined to become an astronaut my sister is taking extra classes in math and physics. B. Since she is determined to become an astronaut my sister is taking extra classes, in math and physics. C. My sister, since she is determined to become an astronaut, is taking extra classes in math and physics. D. My sister since she is determined to become an astronaut is taking extra classes in math and physics.

Answer 1

A is the best one. The rest seem to be comma splicing!