Difference between consented and concerted

[paulyamashi]

Test No. incompl/advan-30 "Letter Writing (2)", question 2

My main news is that Mary has at long last ......... to marry me.

(a) concerned
(b) convened
(c) concerted
(d) consented

Test No. incompl/advan-30 "Letter Writing (2)", answer 2

My main news is that Mary has at long last consented to marry me.

Correct answer: (d) consented

Your answer was: incorrect
My main news is that Mary has at long last concerted to marry me.
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concerted is a word to concert someone you love to,why you choose consented but not concerted.can you explain it clearly for me,thanks

[Alan]

Consent means agree, which you need here. Concerted is an adjective meaning concentrated.
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