Matt must send a refusal letter to Ryan, who recently interviewed for a job. Which of the following will be the best closing?

A、If you have any questions, Ryan, please do not hesitate to call me.;
B、If you had the required five years' experience in social work, we could have included you in the final slate of candidates.;
C、Again, Ryan, we truly regret being unable to offer you this position.;
D、We wish you all the best in your job search.