Recently, debate over if a budget surplus

Recently, debate over if a budget surplus should be applied towards lower taxes or increased spending on welfare initiatives has become a polarizing political issue.

A. over if a budget surplus should be applied towards lower taxes or increased spending
B. over whether a budget surplus should be applied towards lowering taxes or increasing spending
C. about a budget surplus applied towards lower taxes or increasing spending
D. about if lower taxes should come from a budget surplus or spending increases
E. concerning a budget surplus and its application towards lower taxes or increased spending

Answer - Choice B: The idiom should be "debate over whether."