In an essay arguing that the county should adopt a school uniform policy, the author makes the following counterclaim:

Many argue that uniforms are too costly to impose as a requirement on all families.

Which answer provides sufficient evidence to support the counterclaim?

Evidence that most families purchase children's clothing on sale or at discount stores
Letters from parents stating they prefer to spend their money on things other than uniforms
Data showing the average costs of uniforms in schools that already have uniform policies
Statistics showing higher achievement scores for students who do not wear uniforms