How many bytes roughly make up one terabyte?

A terabyte is a unit of digital information storage that is equal to approximately one trillion bytes. This measurement is commonly used in computing and data storage contexts.

To understand why one trillion bytes corresponds to a terabyte, it's essential to recognize that the metric system prefixes indicate powers of 10. Specifically, "tera-" denotes a factor of (10^{12}), or one trillion.

In contrast, the other options represent much smaller quantities—one billion bytes is equivalent to a gigabyte, one million bytes is a megabyte, and one hundred billion bytes is less than a terabyte. Therefore, the correct answer accurately reflects the definition of a terabyte in terms of bytes, which is one trillion.