The answer is their because "the girls" is plural, meaning more than 1 girl is being addressed. Therefore, the answer cannot be her.
While looking through the magazine i saw this beautiful woman, in a red silky dress, with beautiful blond hair and gorgeous green eyes, she was sitting on a dark brown chair with her legs crossed and her hands in her lap, with dark purple nails. While she was sitting she had the most beautiful smile that anyone has ever seen. And she had dark mid-night colored high-heels with rhinestones on them. Her hair was half up half down with braids going down the side of her head leading on to her long silky hair and her hair was curled in the prettyist way. She looked so elegant like a Queen.
Prose must explain complete ideas because it enables the reader to comprehend the authors vision, and thought process as well as the emotional state that the author wants the character(s) to have. This is in the case of fiction.
When it comes to nonfiction it enables the reader to understand the material or the argument presented in front of him or her. Furthermore, arguments when presented with evidence which incorporates complete ideas and knowledge of the topic in question. It gives the reader a proper explanation and answers to the questions that may arise whilst reading the informative material at hand.
I would say science but since it was wrong math!!?