UPSC 2015 CDS II English Paper

In the context of the given statement, ‘isn’t’ must be replaced with ‘doesn’t it’ as ‘Earth’ will take ‘does’ and not ‘is’. The tag keeps the same helping verb as used in the statement. Here, the verb ‘moves’ has been used. So, the helping verb that will be used is ‘does’. Thus, option (c) is correct.