The correct answer is C. Preparing questions that demonstrate your interest in the job
Step-by-step explanation:
An interview is a type of communicative situation in which the employer or representative of this, asks questions or speaks to a possible candidate to determine whether he or she is suitable for a job vacant. Indeed, besides the resume of the candidate the interview can determine whether the candidate is hired.
Because of this, there are different steps to follow for a successful interview that includes being informed about the job vacancy and the employer, preparing the resume and also preparing the questions as in most interviews the questions are similar and therefore the candidate can prepare them to give the best answers and also show his interest. Therefore, a key to a successful interview is "Preparing questions that demonstrate your interest in the job".