Final answer:
The option that creates an equation with an infinite solution is B. -1c, because when we substitute -1c into the equation, we get -1c - 4 = -1c - 4, which is always true for any value of c.
Step-by-step explanation:
A quadratic equation has an infinite solution when the discriminant (b^2 - 4ac) is equal to zero. In the given equation, 2c + (3c - 4) = ? - 4, we can simplify it to 5c - 4 = ? - 4. The option that creates an equation with an infinite solution is B. -1c, because when we substitute -1c into the equation, we get -1c - 4 = -1c - 4, which is always true for any value of c.