The correct answer is C. The mosquito is flying over your head.
The other options are incorrect because they do not accurately describe the location of the mosquito. Option A is incorrect because the mosquito is not inside your head. Option B is incorrect because the mosquito is not outside your head. Option D is incorrect because the mosquito is not on your head.
The mosquito is flying over your head because it is trying to find a place to land and bite you. Mosquitoes are attracted to humans by the carbon dioxide we exhale, so they are often found flying around our heads. If you see a mosquito flying around your head, it is best to swat it away or use a repellent to keep it away.