The correct option is D Winter
Greenhouse
Greenhouse is a small glasshouse used for growing plants that becomes warmer in sunlight.
It only allows the light to enter and prevents the heat from escaping out.
Use of greenhouse
The greenhouse is mostly used for growing sensitive and out-of -season plants. However, it is used especially during winter.
This is because a greenhouse provides ambient temperature and sunlight for the growth of the plants.
Final answer
(b) winter