How do i go about answering this question please?...

In a chemical reaction zinc metal reacts with perchloric acid solution, HclO4, to produce zinc
perchlorate (in solution), and hydrogen gas, which escapes. The species being oxidised in this
reaction is;
a) HclO4 (aq)
b) H2(g)
c) Zn2+ (aq)
d) Zn (s)
e) Zn(ClO4)2 (aq)