The answer is B - their. Both the knight and his squire are people, and if they ever have differences in gender, to make the sentence structure easy, 'their' is the appropriate word that will complete the sentence structure. They forgot to pack 'their' food.
C. developes, supports, or explains the main idea of a paragraph.
The answer is - Mr. Schlosser takes the reader on a behind-the-scenes tour of the fast-food industry that includes slaughterhouses, poultry processors, artificial flavors, e. coli bacteria and workplace violence. -
apex ;)