Instructions: the Following Sentences Form a Paragraph

Multiple Choice

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

A) The cook steamed everything in a big pot, and he seasoned the mixture with soy sauce.
B) The cook steamed everything in a big pot so he seasoned the mixture with soy sauce.
C) The cook steamed everything in a big pot, yet he seasoned the mixture with soy sauce.