The rise in free,do-it-yourself instructions on the internet

The rise in free, do-it-yourself instructions on the Internet for home repairs has led to a decrease in revenue for home service technicians and an increase in the number of injuries caused by people who have attempted home repairs themselves. Unfortunately, not all of the do-it-yourself instructions on the Internet are written as well as they should be.

Which of the following can be inferred from the argument above?

A. The number of people who are not home repair technicians and who have been injured while attempting home repairs has increased.
B. Most people who are injured while attempting home repairs have done so while following instructions found in free do-it-yourself instructions on the Internet.
C. The overall sale of online do-it-yourself home repair instructions by home service technicians has not been equal to the loss of revenue the technicians have incurred due to free offerings of this sort of material.
D. Most free do-it-yourself home repair instructions found on the Internet do not provide enough clear information regarding safety precautions.
E. As more free do-it-yourself instructions for home repairs are made available on the Internet, home service technicians will suffer more losses in revenue.

How on earth is that the QA ??