Which of the following is a strength of online self assessments

What if i told you.. you could get free points and brainliest for answering this one drivers ed question ! hurry : ) to begin measuring your following distance, watch as the rear end of the vehicle ahead passes a. the rear end of a vehicle on the right b. the front end of an oncoming vehicle c. a fixed point on the road d. a distant landmark

The double-blind procedure is most for a.random assignment b.the placebo effect c.operational definitions replication d. standard deviations

Ineed an answer for this one (number 8)