The one you enjoy the most. It'll be easier and you'll get a lot more out of it - but everything overlaps, so you'll need at least the minimum of the others to give you an edge. It's no use being great at history if your English is weak and even biology needs some math. Math drives the universe(s) but you can't express its meaning without good English. My career was built on biology - businesses are very like organisms.
Math, English and Science because you can go study anything with those and it teaches your logic and language skills (The higher our language skills the better our minds are developed and the smarter we are - for most of the population). then I also think art is useful because it teaches you to look at things in a different light.
Math. But basically math english and science are fully useful to everyone.
I think math and science
Lunch. Kidding. Math.