Supporters of tax breaks that local governments award to businesses each year to prevent them from moving consider them vital economic development tools
while critics denounce the tax breaks as corporate welfare that helps some localities but weakens the national economy.
(a) Supporters of tax breaks that local governments award to businesses each year to prevent them from moving consider them vital economic development tools
(b) Supporters consider tax breaks that local governments award businesses each year to prevent them from moving to be vital economic development tools
(c) Supporters of tax breaks that local governments award businesses each year to prevent them from moving consider them vital economic development tools
(d) Supporters consider tax breaks that local governments award businesses each year to prevent them from moving vital economic development tools
(e) Supporters of tax breaks that local governments award businesses each year to prevent them from moving consider the tax breaks to be vital economic development tools
According to the explanation, the pronoun "them" in the phrase "to prevent them" correctly refers to "businesses'. I had assumed that "them" illogically referred to "Supporters", which is the subject of the sentence. Why does "them" clearly refer to businesses? It wasn't an issue in this example, but there are times I falsely eliminate an answer choice because I think the pronoun's antecedent is ambiguous.