In the following question find out the alternative which will replace the question mark?
 

Grain : Stock :: Stick : ? 

Bundle 

The answer is Bundle.

The analogy is between grain and stock, and stick and bundle. Grain is a collection of small, individual pieces, and stock is a collection of grain. Similarly, a stick is a collection of small, individual pieces, and a bundle is a collection of sticks.

The other answer choices do not fit the analogy. Group is a collection of people or things, string is a long, thin piece of material, and collection is a group of things that are gathered together. None of these are a collection of small, individual pieces like grain or sticks.