The answer is C because that is the only case of two independent clauses joined by ", and".
I would say B.
A is wrong because communication skills are equally important to technical.
C is wrong because communication is a huge part of job success.
D is wrong because everything can be taught one way or another.
[ Answer ]
One of the softball players left <u><em>their </em></u>bat at the field after practice.
[ Explanation ]
<em>Their </em>- Belonging to them
<em>They're </em>- Replaces the word(s) "They are"
<em>There - </em>A position
Out of the options Their, They're and There, the option Their is the correct option. This type of their means that the item belongs to them. The other two types are incorrect and out of context for this sentence.
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Uh huh, sounds like a personal problem