Which of the following would least likely support the prosecution's case against

Which of the following would least likely support the prosecution's case against a defendant charged with driving while intoxicated?

a. an arresting officer's testimony concerning a field sobriety test

b. a police officer's testimony that in his experience any male is incapable of operating a motor vehicle within two hours after drinking three beers

c. that the chemical test given defendant indicated a 0.12% blood alcohol level

d. testimony of an eyewitness who states that, when arrested, the defendant spoke erratically, was unstable, and loudly cursed the arresting officer