If you ask me, this is a very BAD question.
First, it wants you to draw your conclusion from I & IV
. That means, II and III are not supposed to play any role in the logical deduction here.
Second, no option in the provided list would enable you to draw that conclusion, even if you consider all statements from I to IV.
I. All wheeled conveyances that travel on the highway are polluters
II. Bicycles are not polluters.
(Here I and II contradict each other.)
III. Whenever I drive my car on the highway, it rains.
IV. It is raining
III and IV says nothing.
A. II were changed to "Bicycles are polluters".
Now I and II are consistent. But III and IV still suggest nothing. You cannot deduce that I am driving my car on the highway because it is raining. Remember, If A then B doens't mean If B then A. But it doesn't mean I'm not driving my car on the highway either. If A then B doesn't mean if B then not A. Further, even if I'm not driving my car on the highway, it doesn't mean my car is not poluting. I only said that a car on the highway would be poluting, but a car not on the highway could be poluting too, we don't know from the premises given. There's no way you can deduce "my car is not poluting" from here.
B. II were changed to "My car is a polluter"
By the same reasoning, II would be consistent with I, but there's no way you can get to the conclusion.
C. III were changed to "If bicycles were polluters, I would be driving my car on the highway".
II says bikes are not polluters. III says if they are then I would be driving my car on the highway. But if they are not I may or may not be driving my car on the highway. And if I am not driving my car on the highway, it may or may not be polluting. Again, can't get to the conclusion.
D. IV were changed to "Rainwater is polluted".
This has nothing to do with anything.
E. IV were changed to "It is not raining"
If I drive my car on the highway it rains. If I don't drive my car on the highway, it may or may not rain. It is not raining, it must be that I am not driving on the highway. However, again, if I'm not driving my car on the highway, it may or may not be polluting.
I would like to know the source of this question. Whoever wrote this question, his logic is seriously messed up. Don't buy his/her books, ever!!!
Keep on asking, and it will be given you;
keep on seeking, and you will find;
keep on knocking, and it will be opened to you.