The statement below is followed by four options. Each option is related to the item in the statement, but only one is always true. Select the option that always holds and makes the statement true.
"A staircase always has ______."
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → Steps
The answer must hold for every staircase, without exception. An option that is present in most cases but can be missing in even one case is not always true.
Option (1) A railing — a few steps at the entrance of a house often have no railing.
Option (2) Steps — a staircase is a set of steps for going up or down; without steps it is a ramp or a slope, not a staircase, so this is always true.
Option (3) A carpet — most staircases are bare stone, cement, wood or metal.
Option (4) Exactly 20 steps — a staircase can have any number of steps, three or thirty.