Answer: a) depends on the rods
Explanation:
Rod cells are the photoreceptor cell that are present in outward edge of retina. It helps in seeing things in low or dim light or darkness by peripheral vision.
According to the question,Jane is able to analyze that her peripheral vision is better at night time due to presents of rod cell in eye which help in photoreception in dim light as compared to central vision.
Other options are incorrect because vision in dim light is not dependent on retina,pupil or cones. Thus, the correct option is option(a).