Judging by you saying ”I have to take a language class to graduate” I get the feeling that you’re not really interested in foreign languages? So if you’re looking for the easiest class, I would probably suggest Spanish. Not that Spanish is the easiest language, but it’s the easiest class. There are so many outside resources for learning Spanish available to you in the U.S., it’s insane. Almost every film or book or TV show has a Spanish dub (Or at least subs). Spanish has gotten into our pop culture quite well, and you probably know more of it than you’d think.
Ignoring outside resources (Books, movies, etc.) I would really say that German is probably the easiest language to learn. At its base, English truly is a Germanic language. The everyday words you use are almost always cognates of words in German. People say that English is a Romance language, but the Romance is really just the icing on the tasty German cake.
If I misinterpreted your statement, then consider some cold numbers:
1) Mandarin (Chinese) is the most common language on Earth. If you’re looking to be able to speak to a large quantity of people, that’s your best choice.
2) Consider that German is a primary language in Germany, Austria, Switzerland, and Luxembourg. If you consider the nominal GDP per capita, Germany is a very important business language. It is also the second most common language after English in the European Union.
3) Spanish is the official language of 20 countries. If you want to be able to go to many different places and speak to people there, Spanish is a good choice.
While I personally disagree with the opinion, I can’t help but notice that if anybody says that any language is sexy, they pick French. That may sway you as well.