Answer:
B. It is questionable that the sponsor is a broadband internet provider because this sponsor can be greatly affected by the conclusion.
Step-by-step explanation:
From this research, the increase in grades of subjects could have been due to materials or other journals accessed on the internet rather than the usage of internet. Because if appropriate materials were not accessed by subjects on the internet, probably the increase would not have been achieved.
Thus, the conclusion of the study could have been influenced by the internet provider so as to encourage subjects to believe that using the internet increases grade. This would then increase exponentially the number of subjects that would subscribe to his services.