The correct response is:
The Northern Hemisphere will be in summer, and the Southern Hemisphere will be in winter.
Responses

The Northern Hemisphere will be in summer, and the Southern Hemisphere will be in winter.
The Northern Hemisphere will be in summer, and the Southern Hemisphere will be in winter.

The Northern Hemisphere will be in winter, and the Southern Hemisphere will be in summer.
The Northern Hemisphere will be in winter, and the Southern Hemisphere will be in summer.

Both hemispheres will be in summer.
Both hemispheres will be in summer.

Both hemispheres will be in winter.
1 answer
The correct response is:
The Northern Hemisphere will be in summer, and the Southern Hemisphere will be in winter.