myChairs[199].WoodType is the following accesses the last Furniture object's wood type
d. myChairs[199].WoodType
Explanation:
An array often has the size range of [0- n-1] where n is number of cell for array. For example, when the array has a size of 5, its index starts from 0 and ends at n-1 ie 4.
So according to the question, the array myChairs is an array of objects declared from the class Furniture. Its index starts from 0 and the last object is at 199. So to access the last object’s WoodType, the following accesses it:
myChairs[199].WoodType.