The correct answer is A. Zero.
The reflection coefficient is a dimensionless quantity that is used to describe the ratio of the reflected wave to the incident wave. It is given by the following equation:
$$\Gamma = \frac{Z_L – Z_0}{Z_L + Z_0}$$
where $Z_L$ is the load impedance and $Z_0$ is the surge impedance of the line.
If the load impedance is equal to the surge impedance of the line, then the reflection coefficient is zero. This means that there is no reflection of the wave at the load, and all of the energy in the wave is transmitted to the load.
Option B is incorrect because the reflection coefficient cannot be greater than or equal to one. Option C is incorrect because the reflection coefficient cannot be infinity. Option D is incorrect because there is a correct answer.