Choose the alternative in which the words in bold and underlined have the same grammar classification as the ones above. A) Sports cars are more ...

Choose the alternative in which the words in bold and underlined have the same grammar classification as the ones above.


A) Sports cars are more powerful than compact cars.
B) In power reactors, heat is converted into electricity.
C) The research team quietly tucked away the results of their study.
D) The useable forms of energy are wind, solar, and hydroelectric power.
E) The powerful engine generates enough heat to require a cooling system.