The statement that best summarizes the passage from "Sugar changed the world" is:
Alexander the Great continued exploring even though his Greek soldiers quit.
The passage emphasizes that he is too curious to stop exploring and even though his soldiers were tired of fighting and homesick ( they have been fighting for a decade!) he called his close friend Nearchus and sent them to investigate the coast of India by ship.
We know by further investigation that he went on the expedition called the Indian campaign and he recorded his investigations in detail. He went as far as the Euphrates before turning back to rejoin Alexander at Susa, in early 324 BC.