In an experiment, tennis players who were told that their performance would be used to assess only the quality of their rackets performed much better than an equally skilled group of tennis players who were told that their tennis-playing talent would be measured. The situation described above most closely conforms to which one of the following propositions?
A: People do less well on a task if they have been told that they will be closely watched while doing it.
B: People execute a task more proficiently when they do not believe their abilities are being judged.
C: People who assess their talents accurately generally perform near their actual level of proficiency.
D: People who think that a superior performance will please those who are testing them generally try harder.
Choose A, B, C or D as your solution.
B