Which other degree would be best for a double major with Mechanical Engineering?

I am applying for college this year, and I am planning on applying to a dual degree program between a liberal arts and larger college with an engineering school. I know that I want to obtain a mechanical engineering degree. What would be most beneficial for a second degree? I am torn between mathematics, chemistry, and physics. I love all of them equally and would love to study them further, but I want to know which one would provide me with more opportunities? (Especially because I don't know what job I would want in the future)