Researchers Used a Flip of the Coin to Assign Participants

Multiple Choice

Researchers used a flip of the coin to assign participants to view either a one-minute public information video about the environment or a control video of the same duration that showed only highlights of entertainment news .The researchers then observed how many participants in each group deposited small water bottles (which they had been given at the outset) into the recycle bin as opposed to an adjacent trash bin .This research involves a(n)

A) Observational study
B) Randomized experiment
C) Quasi-experiment
D) Natural experiment