Consider the following invalid argument:
1. Some parapraxes can be explained in part by physical fatigue.
2. If an act is wholly caused by physical fatigue, then it has no sense.
Therefore, no parapraxes have a sense.
Which of the following offers a counter-example that demonstrates the invalidity of this argument's conclusion?
A All parapraxes can be wholly explained by physical fatigue
B Suppose that some parapraxes cannot be explained in part by physical fatigue, and suppose that some of those have a sense; if these suppositions were true, we could conclude that some parapraxes have a sense
C Suppose that some parapraxes have no sense, and suppose that physical fatigue determines all of our actions; if these suppositions were true, then no parapraxes would have a sense.
D If an act has a sense, then it is wholly caused by physical fatigue.