Essential Part - Verbal and Reasoning

Directions to SolveEach question has an underlined word followed by four answer choices. You will choose the word that is a necessary part of the underlined word.
Q1:

lightning

A electricity

B thunder

C brightness

D rain

ANS:A - electricity

Explanation: 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).