Question

consider this claim:
wearing shoes inside a house is unsanitary and should be avoided.
which is the strongest evidence to support the claim?
a national survey found that sixty-three percent of americans opt not to wear their shoes inside their homes.
researchers have found that shoes have millions of potentially harmful bacteria on them, as well as allergens.
affordable shoe racks offer a convenient way to organize shoes in the entryway of homes.

Explanation:

The claim focuses on the unsanitary nature of wearing shoes indoors. A survey of people's habits only shows preference, not evidence of unsanitary conditions. Shoe racks are a solution for organizing shoes, not evidence of unsanitary risk. The research on harmful bacteria and allergens directly links shoes to unsanitary factors that support the claim.

Answer:

Researchers have found that shoes have millions of potentially harmful bacteria on them, as well as allergens.