In the following passages at certain points you are given a choice of three words in brackets, one of which fits the meaning of the passage. Choose the word which best fits the meaning of the passage and mark the corresponding letter viz. (a), (b) or (c) on your Answer Sheet.

Passage-I. One of the most interesting new books published recently is "Spaceship" by Prof. E.C. Walker. Our earth, he says, is like a spaceship, and all the 400 million people ______ earth are passengers on it.