Mr. James, the owner of Squeaky Clean Floor Company, invented a solution that he claims is better than the other top three selling floor cleaners. To prove his claim, Mr. James performed several experiments. His results appear below.
Brand of Floor Cleaner Type of Floor Type of Debris
Spread on Floor # of Trials Cleaned Floor?
Squeaky Clean Brand Vinyl Dust 5 yes
Leading Brand 1 Vinyl Grease 5 no
Leading Brand 2 Vinyl Paint 5 no
Leading Brand 3 Vinyl Mud 5 no
Which of the following is true of Mr. James' experimental procedures and results?
A.
Mr. James' results are biased. Since he is the owner of the floor company, it is impossible for his experimental set-up to be fair and reliable.

B.
Mr. James' results are reliable because he performed the same number of trials for each brand of floor cleaner.

C.
Mr. James' results are reliable because he used the same type of floor for every trial of each brand of floor cleaner.

D.
Mr. James' results are biased. He selected different types of debris to make it easier for his floor cleaner to be effective.