According to The Elements of Style, the correct way to punctuate this sentence is, Conservationists are considering urban runoff, and they are tracking population growth, but the magnitude of the situation has not been determined.
Answer: Option C.
Step-by-step explanation:
Punctuations are the marks such as comma, semicolon, exclamation that we use while writing. Punctuation helps to give a clear meaning to the sentence. ‘The Elements of style’ is a book written by William Strunk which describes the proper way of writing style.
From the sentences given below, the correct way to punctuate this sentence is, ‘Conservationists are considering urban runoff, and they are tracking population growth, but the magnitude of the situation has not been determined.’ Here we can see that after the dangler is separated with a comma. Apart from this in the first line, two ideas are being discussed which is further separated by adding comma thus making a sentence readable.