Final answer:
Option (a), In a trial, the prosecutor or defense attorney may question a witness about his knowledge of a location such as a pub. The judge supervises the trial, while the jury is responsible for determining the verdict.
Step-by-step explanation:
The person who questioned the witness about his familiarity with a certain London pub could be the prosecutor or the defense attorney. In a trial setting, it is common for both the prosecutor and the defense attorney to question witnesses. The prosecutor tries to prove the defendant's guilt, while the defense attorney aims to maintain the defendant's innocence or establish doubt regarding their guilt.
The role of the judge is to oversee the trial proceedings and ensure everything is conducted in accordance with the law. The jury, on the other hand, deliberates on the evidence and arguments presented to determine the outcome of the trial.