The correct answer is A. unbiased.
A prejudiced decision is one that is made based on prejudice, which is a preconceived opinion that is not based on reason or actual experience. An unbiased decision is one that is made without prejudice or favoritism.
B. candid means honest and straightforward. A candid decision would be one that is made honestly and without trying to hide anything.
C. helpful means providing assistance or support. A helpful decision would be one that is made with the intention of helping someone or something.
D. logical means based on or in accordance with logic. A logical decision would be one that is made using reason and evidence.
In this case, the decision was clearly made based on prejudice, so the correct answer is A.