Question #6421735Single Choice

Algebra-1

Question

A vaccine was introduced to prevent a certain disease. After the vaccine was widely administered, the number of cases dropped by 95% over a few years. Scientists conclude that the vaccine causes a reduction in the disease.

Which of the following best supports this conclusion?

Options

The disease naturally declines over time, regardless of vaccination.

Countries that did not introduce the vaccine saw no significant decrease in the disease.

Other public health measures, like improved sanitation, were implemented during the same period.

The decline could be coincidental, as disease outbreaks often fluctuate naturally.

Answer & Analysis

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