Final answer:
RAM is most commonly measured in gigabytes (GB), with one GB consisting of approximately 1,024 megabytes (MB). Therefore, the correct answer is 'B. gigabytes'.
Step-by-step explanation:
RAM, or Random Access Memory, is typically measured in gigabytes (GB). A gigabyte is a unit used to measure computer storage space and is comprised of approximately 1,024 megabytes (MB), while each MB consists of about 1,024 kilobytes (KB). As a point of reference, one kilobyte can be equated to about 1,024 bytes, which roughly amounts to 180 English words or perhaps three minutes of brisk typing.
Computer storage space can also be measured in terabytes (TB), where one TB is equal to 1,024 GB. However, when we talk about RAM in the context of everyday computers and smartphones, gigabytes are the most common unit of measurement used. Thus, the correct answer to the question is 'B. gigabytes'.