When can you legally pass another vehicle on the right side?

Answer: C — When driving on a one-way street with multiple lanes.

You can legally pass another vehicle on the right side when driving on a one-way street with multiple lanes. This is because it is typically allowed for a vehicle to pass on either side when there is more than one lane going in the same direction. Option A may seem like a possible answer, but it is actually incorrect because signaling a left turn does not necessarily guarantee that the vehicle will turn left, and it is not safe to assume. Option B is incorrect because it is not always legal to use the paved shoulder for passing, as it is meant for emergency use only. As for Option D, it is not a completely accurate statement, as there are certain situations where passing on the right may be allowed, such as on a highway with multiple lanes. However, it is generally not recommended to pass on the right, so Option C is the safest and most correct choice.