The correct answer is:
C. Next
Step-by-step explanation:
Authors in their texts usually use text structures to organize their writings. In this case if the author wantsto clue the reader about something in chronological order he should use a "Sequential Text Structure". In this text structure the transitional words we find are: first, next, then, finally, before, by the time, soon, meanwhile. That's why next is the correct answer choice.