When are dichotomous questions appropriate?

Question $6$Select one:

a$.$

Respondent defines answer choices as mutually exclusive

b$.$

Respondent would clarify their choice $($e$.$g$.$ under specific conditions, A; other conditions, B$,$ etc.$)$

c$.$

Respondent doesn't have a clear choice among the answer choices

d$.$

Respondent views answer choices as too extreme