The correct verbs that agree with the subject "everyone" are:
- is
- agrees (not listed in your responses, but if we consider "agree" to mean "agrees," then this one would fit)
"Everyone" is a singular subject, so it takes singular verbs. Therefore, "is" is correct, and "agree" (if understood as "agrees") would also be correct.
Among the options given, only "is" is definitely correct. The verb "agree" could also be considered correct if interpreted as a singular form in context; however, "agrees" wasn't listed directly in your options. The other responses (relies, were, think) do not fit with "everyone".
So, the definitive answer from your options is:
- is (first correct answer)
- agree (second answer if interpreted as "agrees").
If only one must be chosen, then is is the safest answer.