Read the sentence. Conservationists are considering urban runoff and they are tracking population growth but the magnitude of the situation has not been determined. According to The Elements of Style , what is the correct way to punctuate this sentence?
Answer
A
Conservationists are considering urban runoff, and they are tracking population growth but, the magnitude of the situation has not been determined.
B
Conservationists are considering urban runoff, and they are tracking population growth, but the magnitude of the situation has not been determined.
C
no change
D
Conservationists are considering urban runoff and they are tracking population growth, but the magnitude of the situation has not been determined.