In the following passage some words have been deleted. Fill in the blanks with the help of the alternatives given. Select the most appropriate option for each blank.
Environmental pollution is a global problem and (161) ______ threat to human survival. The causes of pollution are quite (162) _______, such as contamination of water, cutting of trees and forests, emission of toxic gases etc. Due to (163) _______ factors, the flora and fauna are adversely affected. An awareness to protect the environment is everybody's (164) ______ duty and we should collectively come forward for this noble campaign. Government is taking strong (165) _____ to check the menace of menace.
Select the most appropriate option for blank No. 161

Options

A. a
B. some
C. an
D. the

Answer

A

Explanation

(a) a
Here only one threat “Environmental pollution” has been used. Indefinite article .A. is used before an indefinite singular noun. So ‘a’ is the most suitable option.