Option C:
is the correct answer.
Explanation:
The given expression is 
We need to determine the factor of the expression.
Now, let us break the given expression into two groups.
Hence, we get,

Simplifying, we get,

Let us factor out 7g from the term 
Hence, we have,

Similarly, let us factor out -6h from the term 
Thus, we have,

Now, we shall factor out the term
, we get,

Thus, the factorization of the given expression is 
Therefore, Option C is the correct answer.