The correct option is C Orchard
An 'orchard' is a piece of enclosed land planted with fruit trees. Hence, option C is correct.
'Park' refers to a large public garden or area of land used for recreation. 'Nursery' is a place where young plants and trees are grown for sale or for planting elsewhere. 'Yard' refers to a piece of land next to a house, which is usually used for growing flowers, grass and other plants. None of these words describe a field or part of a garden where fruit trees grow. Hence, options A, B and D are incorrect.