Answer:
A is the answer
Explanation:
d) run-on
It's missing a comma:
Learning to sail is challenging and exhilarating<u> it</u> is also not the easiest thing to do.
A run-on is a sentence in which two or more independent clauses (i.e., complete sentences) are joined without an appropriate punctuation or conjunction.
doesnt
because dont usually refers to a singular sentence or example " I dont want to see the movie."
c
B
Showing how it has increased will help people understand what you are talking about more.
