Sahira is sorry...the mistake she has made.
1.for
2.in
3.by​

Sahira is sorry the mistake she has made.

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Explanation:

A preposition is defined as a word or group of words that is used before a noun, pronoun, or noun phrase.

Examples of preposition :- after, at, before, behind, by, during, for, from, in, of, over, past, to, under, up, etc.

when alex falls for the charming new boy at school, cole -- a handsome, funny, sports star who adores her - she can't believe she's finally found her soul who truly loves and understands her.  

at first, alex is blissfully happy. sure, cole seems a little jealous of her relationship with her close friend zack, but what guy would want his girlfriend spending all her time with another boy? as the months pass, though, alex can no longer ignore cole's small put-downs, pinches, or increasingly violent threats.  

as alex struggles to come to terms with the sweet boyfriend she fell in love with and the boyfriend whose "love" she no longer recognizes, she is forced to choose -- between her "true love" and herself.

explanation: