The correct answer is: C. July and winter.
The Earth’s axis is tilted at an angle of 23.5 degrees relative to its orbital plane. This means that the Northern Hemisphere is tilted towards the sun in the summer and away from the sun in the winter. The Southern Hemisphere is tilted towards the sun in the winter and away from the sun in the summer.
So, when it is January and winter in the Northern Hemisphere, it is July and winter in the Southern Hemisphere.
Option A is incorrect because it says that it is January and summer in the Southern Hemisphere. This is not true, because it is winter in the Southern Hemisphere when it is summer in the Northern Hemisphere.
Option B is incorrect because it says that it is January and winter in the Southern Hemisphere. This is not true, because it is winter in the Southern Hemisphere when it is summer in the Northern Hemisphere.
Option D is incorrect because it says that it is July and summer in the Southern Hemisphere. This is not true, because it is winter in the Southern Hemisphere when it is summer in the Northern Hemisphere.