Fill in the blank with the appropriate Article.

This is ________ great idea!

Choose from the options given below:

a

The correct answer is Option (1) - a

The sentence should be: "This is a great idea!"

Explanation:
 "A" is used before words that begin with a consonant sound, and "great" starts with the consonant sound of "g," so "a" is the appropriate article here.
"An" is used before words starting with a vowel sound, which isn't the case here.
"The" is a definite article, used when referring to something specific, but in this sentence, it is used in a general sense.