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 that is punctuated correctly. Which sentence is correct?

A) None of the right ingredients was available therefore he told his cook to buy anything that looked interesting.
B) None of the right ingredients was available because he told his cook to buy anything that looked interesting.
C) Because none of the right ingredients was available, he told his cook to buy anything that looked interesting.