问题详情

Acompanypredictedthatthelearningrateforproductionofanewproductwouldbe80%.Theactuallearningratewas75%.Thefollowingpossiblereasonswerestatedforthis:
(i)Thenumberofnewemployeesrecruitedwaslowerthanexpected
(ii)Unexpectedproblemswereencounteredwithproduction
(iii)UnexpectedchangestoHealthandSafetylawsmeantthatthecompanyhadtoincreasethenumberofbreaksduringproductionforemployees
Whichoftheabovereasonscouldhavecausedthedifferencebetweentheexpectedrateoflearningandtheactualrateoflearning？
A.Alloftheabove
B.(ii)and(iii)only
C.(i)only
D.Noneoftheabove

请帮忙给出正确答案和分析，谢谢！