1 GB is equal to:

Digital storage prefixes come in two distinct conventions. The SI/decimal convention (kilo = 103, mega = 106, giga = 109) defines 1 KB = 1000 bytes, 1 MB = 1000 KB, and 1 GB = 1000 MB exactly — this is the standard meaning of the plain unit symbols KB/MB/GB. Separately, the IEC/binary convention uses distinct unit symbols (KiB, MiB, GiB) where each step is 1024 (= 210): 1 KiB = 1024 bytes, 1 MiB = 1024 KiB, 1 GiB = 1024 MiB. These are two different, non-interchangeable systems; the binary figure of 1024 belongs to GiB/MiB, not to GB/MB.

This question asks about 1 GB (the plain, SI-convention unit), so the applicable relationship is 1 GB = 1000 MB exactly. Chaining the SI conversions confirms it: 1 KB = 1000 bytes, 1 MB = 1000 KB, so 1 GB = 1000 x 1000 KB = 1000 MB.

Among the four choices offered — 10 MB, 100 MB, 1000 MB, and 10000 MB — only 1000 MB matches the SI relationship between GB and MB. Under the separate binary convention, 1 GiB would equal 1024 MiB, but that figure is not among the options offered here, and this question uses the plain GB/MB units rather than GiB/MiB, so the binary figure does not apply. 1000 MB is therefore the correct choice among the options given.