Natural
Obvious
な adjective, の adjective
とうぜん
当たり前 （あたりまえ） Natural, Reasonable, Obvious, Usual, Common
当然 （とうぜん） Natural, Obvious
自然 （しぜん） Nature, Natural
天然 （てんねん） Natural
整然 （せいぜん） Orderly, Systematic, Well Organized, Natural Order
Yuri says both 当たり前 and 当然 are pretty much the same. 当たり前 is a bit more casual.
It's correct according to nature. It's Natural and Obvious.