The following is an English comprehension task, and we can't agree upon the correct answer. According to the textbook, answer B is correct. However, in my opinion, it is clearly lacking the word not. If the word "not" is put in, then it makes sense - otherwise it doesn't make sense for me. Could a native speaker confirm this?
- Attention Deficit Disorder (ADD) is a condition characterized by an Inability to focus on any topic for a prolonged period of time, and is especially common among children five to ten years old. A recent study has shown that 85 percent of seven-year-old children with ADD watch, on average, more than five hours of television a day. It is therefore very likely that Ed, age seven, has ADD, since he watches roughly six hours of television a day.
The argument above is flawed because it:
(A) cites as a direct causal mechanism a factor that may only be a partial cause of the condition in question
(B) fails to indicate the chances of having ADD among seven-year-old children who watch more than five hours of television a day
(C) limits the description of the symptoms of ADD to an inability to focus for a prolonged period of time
(D) fails to consider the possibility that Ed may be among the 15 percent of children who do not watch more than five hours of television a day
(E) does not allow for other causes of ADD besides television watching