The correct option is A Spinach
Long-day plants flower and grow when the daylight obtained by them is more than their critical (required) photoperiod, like in summer season. They need more light than short-day plants and usually flower when the temperature becomes warmer. Examples of long day plants are spinach, lettuce, radish, sugar beet, etc.
Short day plants flower and grow when the daylight obtained by them is lower than their critical photoperiod. Tobacco, maize and Chrysanthemum are a few examples of short day plants.
Day-neutral plants flower and grow regardless of the length of the period of light they are exposed to. Tomato, cucumbers are some examples of day-neutral plants.