A Gigabyte equals all of the following, except, _________.

Let's check the values using standard decimal (SI) notation:$1\text{Gigabyte (GB)}=10^9\text{bytes}$ Option A: $1000\text{Megabytes}=1000\times 10^6\text{bytes}=10^9\text{bytes}$ (Correct)Option C: $1\text{Million Kilobytes}=1,000,000\times 10^3\text{bytes}=10^9\text{bytes}$ (Correct)Option D: $1\text{thousandth of a Terabyte}=\frac{1}{1000}\times 10^{12}\text{bytes}=10^9\text{bytes}$ (Correct)Option B: A trillion bytes is $10^{12}\text{bytes}$, which is equal to $1\text{Terabyte (TB)}$, not a Gigabyte.