Correct Answer: Banyan : Tree

Solution : Given:
Rose : Flower :: ? : ?

Like, Rose is a type of Flower.

Let's check the options –
First option: Rose : Land; Roses are grown on the surface of land..
Second option: Mustard : Yellow; Both the words mustard and yellow specify the colour.
Third option: Garden : Plant; Plants are grown in a garden.
Fourth option: Banyan : Tree; Banyan is a type of tree.

So, only the fourth option follows the same pattern as followed by the given pair of words. Hence, the fourth option is correct.