Why did Mahendra need to keep moving from one site to another?

Read the following passage carefully and choose the most appropriate answer to the question out of the four alternatives.   Mahendra’s job was to keep an eye on the activities at the work site. He had to keep moving from place to place every now and then as ordered by his head office: from a coal mining area to a railway bridge construction site, from there after a few months to a chemical plant which was coming up somewhere. One night Mahendra woke up from his sleep and saw “a dark cloudy form”. He broke out into a cold sweat. Was it a ghost? He was a bachelor. His needs were simple and he was able to adjust himself to all kinds of odd conditions, whether it was an ill-equipped circuit house or a makeshift canvas tent in the middle of a stone quarry. But one asset he had was his cook, Iswaran. The cook was quite attached to Mahendra and followed him uncomplainingly wherever he was posted. He cooked for Mahendra, washed his clothes and chatted away with his master at night. He could weave out endless stories and anecdotes on varied subjects.