The correct answer is: C. 1024 megabytes.
A gigabyte (GB) is a unit of information or computer storage equal to one billion (1,073,741,824) bytes. It is a multiple of the unit byte, which is the basic unit of information in computing. The prefix giga- is a SI prefix meaning one billion (109), so one gigabyte is equal to 1,073,741,824 bytes.
The term gigabyte is often used to describe the amount of storage space on a computer hard drive or other storage device. It is also used to describe the amount of memory in a computer’s processor or graphics card.
The other options are incorrect because they do not represent the correct number of bytes in a gigabyte. Option A is incorrect because it represents the number of bytes in a kilobyte. Option B is incorrect because it represents the number of bytes in a megabyte. Option D is incorrect because it represents the number of bytes in a terabyte. Option E is incorrect because it is not a valid option.