In the following question, out of the four alternatives, select the alternative which best expresses the meaning of the idiom/phrase.
"to buy a lemon"

1. A
   to purchase a vehicle that constantly gives problems
2. B
   buying only half the recipe will not help you prepare the full dish
3. C
   to purchase an insignificant thing which eventually becomes very useful
4. D
   to buy stuff which you don't need