IN the mid-1920s the Hawthorne Woraks of the western electric company was the scene of an intensive series of experiments that would investigate changes in working condition as to their effects on worker's performance

a)that would investigate change in working conditions as to their efects on workers' performance

b)investigating the effects that changes in working condition would have on worker's performance

c)for investigating waht the effects on worker's performance are the changes in working condition would cause

d)that investigated changes in working conditions's effects on workers' performance

e)to investigate what the effects changes in working conditions would have on worker's performance