You can best show a business your interest in their job position through:

A.) social media

b.) an application

c.) a resume

d.) a cover letter

d.) a cover letter

Explanation:

The best way to show a company/business your interest in the job position is through the cover letter. This is a letter that goes in front of your resume when applying for a job and is where the applicant usually explains who they are and why they want the job. This cover letter is the first thing that the employer will see and should tell them why you want the job and why you are the best choice for that job in order to convince them into interviewing or hiring you.