Which sentence is written correctly? being only three, the play did not interest her. being only three, she was not interested in the play. as a three year-old, the play did not interest her.

The correct statement is Being only three, she was not interested in the play.

Option (b);

EXPLANATION:

For a correct statement it should have a meaningful content followed by the proper use of punctuation and commas in the statement.In option C, compound adjective three-year-old is written incorrectly. In English Grammar, we have many kinds of adjectives and one of them is Compound adjectives.

They are written with a hyphen in between. For example five-story building, two-hour meeting, etc. But there is no hyphen after 'three' in option C making it grammatically incorrect. The first statement is also grammatically incorrect. So, The Second Statement is the correct answer.

reasoning from several particular examples to establish a general principle