Select the most appropriate word to fill in the blank.
The trio of women at the table _____________ representative of the enormous flux of American life.

The correct answer is (b) was.
Explanation: The subject, "the trio of women," is singular because "trio" refers to a single group. Therefore, the correct verb to use here is "was," as it agrees with the singular subject.
Meanings of all options:
· Had being: Incorrect usage, no meaning in this context.
· Was: The past tense of "is," used for singular subjects.
· Has been: Present perfect tense, used for ongoing actions from the past.
· Were: The past tense of "are," used for plural subjects.
Correct sentence: "The trio of women at the table was representative of the enormous flux of American life."