a. use the same grammatical construction in all similar headings throughout an outline
Using the same grammatical construction in all similar headings throughout an outline is called parallel construction. Parallel construction is also known as parallelism. This means that two or more ideas has the same degree of importance in the sentence therefore it should be written or stated grammatically equal. This can also help in establishing the clarity of the idea you want to convey in the sentence. Some examples of parallelism are the following :
of loving so much
of hating too hard
of crying so long
Look left and right
Listen in case of anything
See whether another car is coming behind to overtake it
Are they crossing the road using a pedestrian crossing
I think that's what would happen
Lily managed to work out the sum by herself.
Answer:
To raise Americans' awareness of the honorable contributions made by those who died while defending our nation. To encourage all Americans to honor those who died as a result of service to this nation by pausing for one minute at 3:00 p.m. (local time) on Memorial Day
It is C. Adverb. I'm not just gonna type this senctence so I can post the answer, as it'll be more than 20 characters.