I need help with the book inexplicable logic of my life

Use a subordinate conjunction to combine these two sentences into one sentence. the journalist met a source at the hotel. this way he would get facts for an article.

How much time has elapsed from the very beginning of "the memior of the conquistador bernal diaz del castillo" to the end? a. castillo's whole life b. a quarter of an hour c. a few weeks d. a decade

People really be on here lying to people about the right answer, dang