The "nariokotome boy" fossil indicates that h. ergaster
a. could grow as tall as modern humans.
b. had short lower limbs.
c. was thin-boned.
d. all of these.

A. could grown as tall as modern humans

Explanation:

The Nariokotome boy is the most complete fossil of an early hominid ever found. This have gave an opportunity for very detailed and accurate examination of this Homo ergaster specimen. The age of dying of the Homo ergaster boy is still debatable, ranging from 8 to 11 years of age. This boy is tall 160 cm, and it is thought that the growth would have been slightly quicker than that of the Homo sapiens, but slower than that of the chimpanzees, so it estimated that it would have reached full growth by the age of 14. Also, it is believed that the approximate height that this Homo ergaster boy would have reached is 185 cm, making it as tall as the modern day humans, or even taller than the majority of the humans in the present.

stress fractures occur largely in the feet and legs and are common in sports that require repetitive impact, primarily running/jumping sports such as gymnastics or track and field.