The question is incomplete , as the options are not given. Here are the options.
The correct option is b.
This because metaplasia is the process where by one mature cell can be replaced by another cell in the body. This is a reversible replacement that take place in the cell of the body. In this kind of replacement, a less differentiated cell replaced the mature cell. It occur when normal columnar ciliated epithelial cells of the bronchial lining have been replaced by stratified squamous epithelial cells.
Viral induction of apoptosis occurs when one or several cells of a living organism are infected with a virus, leading to cell death. Cell death in organisms is necessary for the normal development of cells and the cell cycle maturation. It is also important in maintaining the regular functions and activities of cells. Hope it helps