This doesn’t lead to the conclusion we need, which is that it’s more important to test household products than to test prescription medications. Like (B), this rule can determine whether testing is important at all, but not whether it’s more or less important.

Like (A), this still doesn’t help us get to the conclusion that testing one kind of product is more important than testing another. Maybe household products and prescription medications are both “very important” to test—and then we’re still stuck.

In other words, if more people’s health might be at risk from household products than from prescription medication, then it’s more important to test household products for safety. This fills the gap in the argument and effectively justifies its reasoning.

This isn’t applicable, it doesn’t trigger, because we’re not talking about a comparison between two medications. We’re trying to compare prescription medication with household products, a different category of products entirely.

In other words, if it’s not the case that a nonmedical product might risk more people’s health, then it’s more important to test the medicine. This rule doesn’t trigger, because in our facts it is the case that household product potentially risk more people’s health.