I believe its:
B- TO PROVIDE DETAILS TO SUPPORT THE ESSAY'S MAIN IDEA
Answer:
answer is: A typical morning in Donora would include the formation of a layer of fog over the town and which would dissipate as the day proceeded (Snyder, 1994). On Tuesday October 26, 1948, this typical morning fog lingered for longer than normal.
Explanation:
I found it on the web.
The second one, it has a capital letter and a full stop which is needed.
foot
Two or more syllables that together make up the smallest unit of rhythm in a poem. For example, an iamb is a foot that has two syllables, one unstressed followed by one stressed. An anapest has three syllables, two unstressed followed by one stressed.