Simplify the expression 6ab + 3ab - 7ab. What is the coefficient of the simplified expression?

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To simplify the expression 6ab + 3ab - 7ab, we need to combine like terms. Like terms have the same variables raised to the same powers.

In this expression, all terms have the variable 'a' and 'b' raised to the power of 1. Therefore, we can combine the coefficients:

6ab + 3ab - 7ab = (6 + 3 - 7)ab = 2ab

The simplified expression is 2ab.

Now, to find the coefficient of the simplified expression, we look at the coefficient of the term that has the highest power of the variable(s). In this case, the variable 'ab' is raised to the power of 1, so the coefficient is 2.

Therefore, the coefficient of the simplified expression 2ab is 2.

The correct answer is C. 2.