Final answer:
The incorrect use of the word 'indigenous' is found in option c) of the question, where it should be replaced by a term like 'impoverished.'
Step-by-step explanation:
You are asked to select the sentence in which the bold-face type word is used incorrectly. The bold-face type word in question is 'indigenous.' The word 'indigenous' means originating or occurring naturally in a particular place; native. Therefore, the sentence where 'indigenous' is used incorrectly is option c) No matter how hard he tried to earn a living, he remained indigenous and dissatisfied. The word is used in place of a word that would indicate poverty or hardship such as 'impoverished,' not 'indigenous' which refers to the original people or things from a particular area.