Answer :
There is nothing I want more than the chance to sing this Song in the Spring concert. This verb agrees with its subject.
The answer is "...nothing I want more than the chance to sing..." When you're not sure, simply take the subject (I) and match it with each of the predates and see which one sounds right.
I is wanting.... no
I want............ yes
I has wanted.. no
I wants.......... no
(The answer is B.)
I is wanting.... no
I want............ yes
I has wanted.. no
I wants.......... no
(The answer is B.)