"The Sports Gene": Which of the following inferences about the jumping success of Stefan Holm is best supported by the last third of the excerpt? Question 15 options: a) Holm was a great high jumper because, like Donald Thomas, he had an exceptionally long Achilles tendon. b) Holm had a stiffer Achilles tendon that helped him jump to greater heights. c) Thomas passed Holm because Holm could not improve the height of his jumps after years of practice. d) Holm became an Olympic champion because of his hard work.

This question seems to be incomplete. However, there´s enough information to find the right answer.

Holm had a stiffer Achilles tendon that helped him jump to greater heights.

Explanation:

In the article "The Sports Gene," by David Epstein, the inference about the jumping success of Stefan Holm that is best supported is that it was Holm´s stiffer Achilles tendon that helped him jump to greater heights.

It´s not inferred that both Holm and Donald Thomas have an exceptionally long Achilles tendon. Nor that Holm was unable to improve the height of his jumps after years of practice.

the following key ideas correctly express the key sentence.

restate key idea: most people can learn to swim in ten short lessons.

restate key idea: the majority of water-accident victims require mouth-to-mouth breathing.

restate key idea: an empty, tightly closed gallon jug will support a tired swimmer.  

restate key idea: first aid is to prevent accidents as well as assist in rescue.

explanation: the key idea needs to have the same topic as the key sentence (drowning and safety).