Which sentence is most effective for a letter refusing a job to a candidate who has been interviewed?

Question $4$Answer

a$.$

Although we are unable to hire you at this time, it was a pleasure to meet you last week.

b$.$

Aaron Bajwa and I enjoyed meeting with you last week and learning about your impressive educational and work experience in the field of accounting.

c$.$

Unfortunately, we interviewed several candidates with stronger CVs$.$

d$.$

Aaron Bajwa and I were extremely impressed with your CV and your performance in our interview last week. We think you have a great career ahead of you.