Answer
Choice D. Move the camera lens closer to the sensor.
Work Step by Step
The subject moving away increases the object distance. The focal length of the lens stays constant. Equation 23-8, $\frac{1}{d_{o}} + \frac{1}{d_{i}} = \frac{1}{f}$, tells us that if $ d_{o}$ increases and f stays the same, the image distance $d_{i}$ must decrease.