I believe it is B.) One every 3-5 seconds. This includes all mirrors, not just the rear view, though I may be wrong, sorry if I am!!
I'm not sure if I understand your question correctly but we food is something that will not always be there for us but it is something that we need and we crave. Food is useful in many ways and helpful. We need love because due to lonliness many have died by commiting suicide.
Yes? I’m so confused, there isn’t really a question