. Two chemical species X and Y combine together to form

Two chemical species X and Y combine together  to form a product P which contains both X and Y

X + Y → P

X and Y cannot  be broken down into simpler substances by simple chemical reactions. Which of the following concerning the species X, Y and P are correct?

(i) P is a compound

(ii)  X and Y are compounds

(iii)  X and Y are elements

(iv) P has a fixed composition

(a) (i), (ii) and (iii),

(b) (i), (ii) and (iv)

(c) (ii), (iii) and (iv)

(d) (i), (iii) and (iv)