I've yet to meet a more exasperating person than my brother-in-law.
A.My brother-in-law is the most exasperating person I've ever met.
B.My brother-in-law is more exasperating than I am.
C.I've met a more exasperating person than my brother-in-law.
D.I've never met the most exasperating person like my brother-in-law.