Which statement provides the most concrete supporting evidence for the author's argument that heatstroke can be very dangerous to
younger athletes?
A)
On average the cost is $50.00 per pill
ath to rapidly
While these tiny lifesavers have proven to be ef
expensive
The player is then rushed indoors and placed in an
decrease his or her body temperature.
Over the past ten years more than two dozen athletes have died from the
medical condition known as heatstroke.

D) Over the past ten years more than two dozen athletes have died from the medical condition known as heatstroke.

Explanation:

A "supporting evidence" is something that backs up a claim to be true. It provides support by showing an important reason about the argument.

Among the choices above, choice D supports the evidence that "heatstroke can be very dangerous to younger athletes." The statement supports the claim with an evidence that many athletes (two dozen) have actually died because of heatstroke. Such statement compels the readers that the claim is true or valid.

So, this explains the answer.