The treatment of the participants in the study raised as much criticism as the results the study generate. Was it ethical to mislead them into believing that they were really inflicting pain on the learners ? Why ?

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.

fertile good for trade etc

taking a bath requires the most water out of the given options because it takes a significant amount of water in order to fill a bathtub.

answer; john locke;