In which sentence is the underlined clause an adjective clause?

a. In many countries in the world, measles was eradicated when a vaccine was developed in 1963.

b. Typhoid fever is a disease that spreads when food or water is infected with deadly bacteria.

c. Whoever is exposed to parasite-carrying mosquitoes can contract the disease malaria.

d. Chicken pox, which causes bumps on the skin, can be spread through coughs and sneezes.







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