posted by Lori .
what is the agreement error in the following sentence:
One of the options concerning his future surgeries were discussed with him.
Only one option WAS discussed with him.
The subject is "one," so the verb must also be singular.
I taught my students to first put parentheses around prepositional phrases. The subject, verb, and complements are never in prepositional phrases.
One (of the options) (concerning his future surgeries) were discussed (with him).