<span>The content of the message was extraordinarily important. to him</span>
Examples of sentences with the structure (not) as... as:
His face is not as round as Tom´s.
Her eyes are not as big as mine.
His nose is as turned-up as his mother´s.
Mary´s hair is as curly as her friend´s.
The policeman is as angry as the car driver.
The TV host is not as bored as the audience.
The children are as happy as their grandparents.
Although "the girls" is in plural form, "each of the girls", the subject, is in singular form.
Therefore, the correct answer is c. her, for it corresponds with the subject.
Hope this helps~
Um what...? Do u need help