Answer: C. It is not likely to be reliable because the testing was biased.
Step-by-step explanation:
Generally the reliability of the products of one commercial production are required to be tested in standard laboratory conditions other than the laboratory owned by the company itself. If the company claims the reliability of the product on the basis of self conducted tests the results will be expected to be biased and unreliable.
On the basis of the above explanation, C. It is not likely to be reliable because the testing was biased. is the correct option.