Answer:
Explanation: In American English, the phrase "a subset of" is typically followed by a singular verb. This is because the word "subset" itself refers to a smaller, specific portion of a larger set or group. Since "subset" is singular, the verb that follows it should also be singular. For example:
"A subset of the data is analyzed."
"A subset of the team has completed the task."
However, it's worth noting that language can be flexible and context-dependent. In some cases, if the emphasis is on the individual elements within the subset, a plural verb might be used. It's generally safer to use a singular verb with "a subset of" in formal writing.