Assertion: Metals and non-metals both can take part in the displacement reaction.

Reason: Metals and non-metals both can displace less reactive metal/non-metal and forms product depending upon activity series.

Choose the appropriate response:

Not only metals but also non-metals can take part in displacement reactions depending upon their order of reactivity.

Metals and non-metals both can displace less reactive metal/non-metal and forms product depending upon activity series.  For example, chlorine can displace bromine from a non-metal salt solution like metal because it is more reactive than bromine. 

Hence, Both Assertion and reason are correct, Reason is the correct explanation for Assertion.