A multiple-choice question has 4 options.
Choosing the correct option gives a student 3 marks.
Choosing the wrong answer incurs negative marks.
So if a student chooses an option randomly, his expected score is zero.
The penalty for a wrong answer is -1.
Suppose the student has successfully eliminated 2 incorrect options.
His expected score, if he chooses randomly among the remaining option, is:
. . (a) 1 . . (b) 1.5 . . (c) 0 . . (d) 3