Aici, + nanacl + al
did al change oxidation number?
yes
no

Yes, Al change oxidation number

Explanation:

For a free element, oxidation number is 0.

Na and Al are free elements we find in the equation as they are not in combination with other elements.

For a compound, the sum of oxidation number of elements = 0.

We know oxidation number of chlorine is -1.

So let us find the oxidation number of Al in

Let x be the oxidation number of Al so,

Oxidation number of Al in  is +3

Oxidation number of Al  changes from +3 to 0.

Decrease in oxidation number indicates is getting reduced in the reaction.

Na oxidation number increases from 0 to +1 shows Na is getting oxidised in the reaction  

The change in oxidation number of the elements represents a redox reaction where both oxidation and reduction takes place simultaneously.

oh it is true if thats what you are asking

i'm pretty sure it is letter c.) car