Does the verb form after "who" attach to "one" or "friends"? Or can both possibilities be argued?
- She gave the document to one of her friends who are trustworthy.
- She gave the document to one of her friends who is trustworthy.
Two other examples:
- She is one of those people who walk miles.
- She is one of those people who walks miles.
I'm wondering whether there is a rule that addresses this issue; namely, I'm wondering if the prepositional phrase can be ignored in 2 and 4 above.