The correct answer is: C. 2 nm to 200 nm.
Viruses are the smallest known life forms. They are so small that they can only be seen with an electron microscope. The size of a virus can vary depending on the type of virus, but most viruses are between 2 and 200 nanometers in diameter.
A nanometer is one billionth of a meter. To put this in perspective, a human hair is about 100,000 nanometers thick.
Viruses are not cells, and they do not have the ability to reproduce on their own. They can only replicate inside the cells of other organisms, which they do by hijacking the cell’s reproductive machinery.
Viruses cause a wide range of diseases in humans, animals, and plants. Some of the most well-known viral diseases include the common cold, the flu, chickenpox, measles, and AIDS.
There is no cure for viral infections, but there are treatments that can help to relieve the symptoms and prevent the spread of the virus.
The four options in the question are all possible sizes for viruses. However, the most common size for a virus is between 2 and 200 nanometers. This is because viruses need to be small enough to enter the cells of their hosts, but they also need to be large enough to contain the genetic material that they need to replicate.
Option A is too small for most viruses. Option B is a possible size for some viruses, but it is not the most common size. Option C is the most common size for viruses. Option D is too large for most viruses.