Answer:
descriptive investigation
Explanation:
The correct answer is a descriptive investigation. An investigation which does not involve hypotheses called descriptive investigation.
These journalists were called muckrakers. They basically "raked the muck" out of society to make it a better place. They uncovered unsafe working conditions and unjust business practices and wrote about them to try to expose corruption.
D. Periodization. this is because none of the other options make sense; chronology is the order of events, geography is the study of geographical locations, continuity is the act or appearance of something continuing into the forseeable future.
