To Introduce
する verb
A 紹介 is an introduction. So the verb version is to introduce.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own. Helps that I introduced introduction to you earlier.
お前にどの娘を紹介するかを選ぶのは難しいよ。
It’s hard to choose which girl to introduce to you.