Because the ladder was in flat position not in slant.
The correct answer is B) "that activity can be justified by no one".
That is the only option written in formal English, as it uses correct grammar and standard English. The other sentences use informal language, as they are written the way they would be spoken: "know more and more", instead of "increasingly more", for example.
Poor physical health can lead to an increase risk of developing mental health problems.
