The correct answer is: Only argument I is strong.
Argument I is strong because it is based on evidence. The statement that interviews are subjective is supported by the fact that different interviewers can have different opinions on the same candidate. This can lead to discrimination and unfairness in the hiring process.
Argument II is weak because it is based on an assumption. The statement that interviews are the only instrument to judge candidates’ motives and personality is an assumption. There are other ways to assess candidates, such as through written tests and performance evaluations.
In conclusion, only argument I is strong.