The Following Sentences Form a Paragraph

Multiple Choice

The following sentences form a paragraph. For each set of choices, select the answer in which conjunctions or conjunctive adverbs are used correctly and the punctuation is correct. Which sentences are correct?

A) Heavy traffic, noise, and fumes fill the city streets; furthermore, some of the city's hills are steep. I'll stick to the bike trail by the river.
B) Although heavy traffic, noise, and fumes fill the city streets, some of the city's hills are steep. I'll stick to the bike trail by the river.
C) Heavy traffic, noise, and fumes fill the city streets, so some of the city's hills are steep. I'll stick to the bike trail by the river.