Which of the following experimental designs can maximize the chances of detecting a small effect?

Many people hang up on telemarketers, but others will listen politely to their pitches even if they are not interested in the product. Telemarketers know that anyone who agrees to listen to a pitch is more likely to buy the product, thanks to the ________

a) risky shift b) polarization c) foot-in-the-door tactic d) door-in-the-face technique

Collectives

a. are small groups of unrelated persons b. have a leader as well as many followers c. follow a clear-cut set of rules d. often form and disband for no readily apparent reasons