Which of the following element is most electropositive?

Which of the following elements is most electropositive?

Element P,Q, R and S belong to the same group. The oxide of P is acidic, oxide of Q and R are amphoteric while the oxide of S is basic. Which of the following elements is the most electropositive ?

Which of the following represents most electropositive element?

Which element is most electropositive?

Which one of the following element the most electropositive element ?

Which one of the following elements has more electropositivity ?