She . . . . . . . . from the crowd because of her height and flaming red hair.

The correct answer is D. stood out.

The other options are not correct because they do not mean the same thing as “stood out.”

• “Stood by” means to remain loyal
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  to someone or something.
• “Stood off” means to keep someone or something
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  away.
• “Stood up” means to get up from a sitting position.

“Stood out” means to be clearly visible or different from others. In this case, the woman stood out from the crowd because of her height and flaming red hair.