An amount/number of something
Quantitative describes the quantity of something
Qualitative describes the quality of something
Answer:
The answer is 2)Us
Explanation:
it is grammatically correct
The only preposition in the options available to you is of, so the correct answer is C.
A) and B) are conjunctions.
D) is an adverb.
Answer:
inside and outside addresses
formal salutations and closings
subject lines specific to the topic