What an excellent idea! (Assertive)
It is a very excellent idea
Correct
It is an excellent idea
It is more excellent idea
It is a very good idea
Explanation:
Correct Answer is: It is a very excellent idea
What an excellent idea! – এটি একটি Exclamatory Sentence.
– Exclamatory Sentence কে Assertive Sentence – এ রূপান্তর করার নিয়ম:
Subject + verb + a/an + very/great + adjective + বাকী অংশ।
তাই সঠিক উত্তরটি হচ্ছে: It is a very excellent idea.
Source: Advanced Learner`s English Grammar & Composition by Chowdhury & Hossain.