<u>Answer:</u> The correct answer is it is a single replacement reaction, and the anions in the two ionic compounds are different.
<u>Explanation:</u>
Single displacement reaction is defined as the reaction in which a more reactive element replaces a less reactive element from its chemical reaction. The chemical equation showing single displacement reaction follows:

A is more reactive element than element C.
Non-metals are the elements which gain electrons to attain negative charge known as anions.
For the chemical reaction:

As, non-metals are present on both the sides of the reaction, thus this means that anion in the chemical reaction are different.
<u>For Example:</u> The reaction of sodium bromide with chlorine gas, the equation follows:

Hence, the correct answer is it is a single replacement reaction, and the anions in the two ionic compounds are different.