C. Validity Effect. After being exposed to something repeatedly, the likelihood increases.
Setting-THIS IS YOUR ANSWER
I HOPE I HELPED
The correct option is this: WRITING IS DIFFICULT BECAUSE SO MANY SKILLS ARE INVOLVED.
A topic sentence refers to the sentence which expresses the main idea of the paragraph in which it occurs. The topic sentence is usually the opening sentence in the paragraph; the other sentences in the paragraph just serve to support the topic sentence.
Order of importance
This essay will give a list of reasons that can be arranged from least to most important or vice versa.
Hope this helps!