The same task triggers different levels of awareness of one' s surroundings, called environmental awareness, in different individuals. Mathematical puzzles, for example, cause most people to increase such an awareness. Some people -- those who formulate the answer visually, imagining the numbers in their mind' s eye -- will, in an attempt to freeze the picture, experience a decrease in environmental awareness while solving the puzzle. Other people' s environmental awareness may rise during the exercise, because their brains are signaling a rest at the end of every stage of problem solving. Which one of the following is most strongly supported by the information above?
A: People who visually formulate answers differ from other problem solvers in that the former are aware of their surroundings.
B: People tend to be more aware of their surroundings when solving mathematical problems than when solving nonmathematical problems.
C: There are some people for whom mathematical puzzles do not cause an increase in their level of environmental awareness.
D: Mathematical problem solving requires frequent periods of rest in the form of increased awareness of the problem solver's surroundings.
Choose A, B, C or D as your solution.
C