The correct answer is: C. Either I or II is implicit
The statement “Interview conducted for selecting people for jobs should measure personality characteristics of candidates” does not explicitly state that performance on a job depends on personality characteristics, nor does it explicitly state that personality characteristics can be measured in an interview. However, both of these assumptions are necessary for the statement to be true.
If performance on a job does not depend on personality characteristics, then there is no point in measuring personality characteristics in an interview. Similarly, if personality characteristics cannot be measured in an interview, then there is no point in trying to do so.
Therefore, either assumption I or assumption II must be implicit in the statement.