Question

before you change lanes, you should:
be sure no one is behind you in your lane
check your mirrors and look over your shoulder
never look over your right shoulder
only check your side mirrors

Explanation:

To determine the correct action before changing lanes, we analyze each option:

• "Be sure no one is behind you in your lane" is insufficient as it doesn't account for vehicles in the target lane or blind spots.
• "Check your mirrors and look over your shoulder" is correct because checking mirrors gives a general view, and looking over the shoulder (shoulder check) helps detect vehicles in blind spots, which is a standard safe driving practice for lane changes.
• "Never look over your right shoulder" is incorrect; shoulder checks (including right shoulder for right - side lane changes) are necessary.
• "Only check your side mirrors" is incorrect as mirrors have blind spots, and shoulder checks are needed to cover those areas.

Answer:

B. Check your mirrors and look over your shoulder