Choose the word that is a necessary part of the underlined word.
lightning

A. electricity

B. thunder

C. brightness

D. rain

Answer: Option A

Solution(By Examveda Team)

Lightning is produced from a discharge of electricity, so electricity is essential. Thunder and rain are not essential to the production of lightning (choices b and d). Brightness may be a byproduct of lightning, but it is not essential (choice c).