Juan is picking out an outfit to wear. The organized list below represents the sample space of all possible outfits.

Blue shirt – Black pants
Blue shirt – White pants
Blue shirt – Blue pants
White shirt – Black pants
White shirt – White pants
White shirt – Blue pants
Tan shirt – Black pants
Tan shirt – White pants
Tan shirt – Blue pants

Based on the list, how many different-color shirts does Juan have to choose from?

6
9
3
1