How does the author's choice to withhold details regarding the fate of the man in the turret of the car and the old woman until paragraph 15 contribute to the suspense in the text

cabeza de vaca was an spanish explorer and n his long exploration of 11,000.km. from florida to present-day mexico, he went through a series of calamities and setbacks that only added to his deeds. he applied his religious creed with the humanist idea, always current and universal, that all men were equal before god and destiny without any discrimination. as an explorer, he became a slave to the tipinoga, then his shaman pointer, later and after an operation of heart to an indian (from which both came alive) he achieved stardom and became a hero followed by a crowd that professed unusual respect and admiration.

the correct answer is:   [d]:   " espionage " .

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i think it is a conjuction because it is definitly not a preposition