The formula to find the midpoint between two points \((x_1, y_1)\) and \((x_2, y_2)\) is:
\[ \left(\frac{x_1 + x_2}{2}, \frac{y_1 + y_2}{2}\right) \]
So, among the provided responses, the correct option would be:
\((\frac{x_1 + x_2}{2}, \frac{y_1 + y_2}{2})\)
Regrettably, none of the options listed in your question accurately represent the correct midpoint formula. Would there be a mistake in the responses you've been provided?