Which a level should i take for business major ( CIE )

Hi guys , i'm a private candidate and im taking CIE A level , I chose Math and Business , i need one more subject only but i'm so hesitant to choose . My friends keep telling me not to take English Lit or English Lang , Psychology is too much time consuming . I'm thinking of classical studies ( classic civilisation ) but i can't find any exact coursebook of this subject. Can someone give me some advices , that'd help a lot . Thank you so much