How to solve these question ....????I am confushed in choosing write option which can be either b or d.

the correcr answer is D),as foe onto its codomain must be equal to its given range,here codomain is all real no.,but range of function is only rational no.s,so function is into

foe one one,its graph should cuts y axis only one  time but here,geaph is parabolic so it cuts 2 times hence function is many one and into