Sahira is sorry [tex]{ \bf{ \underbrace{for}}}[/tex] the mistake she has made.
[tex]\boxed{ 1.\:for }[/tex] ✔
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.
[tex]\bold{ \green{ \star{ \orange{Happy\:learning!}}}}⋆[/tex]