Answer:
A. The word "while" helps the reader determine that the character goes to the market at the same time the water is heating.
Explanation:
Hyphens are used to link words that function as a single adjective before a noun. They are used with compound numbers, and to avoid confusion or awkward letter combinations. Hyphens are also used with certain prefixes and suffixes and/or in specific circumstances.
The proffesor will grade her paper by evaluating the criteria as listed on the rubric.