Correct Option: A

The given statement refers that there will be more amendments, but that its basic structure will still remain the same. Option (b) is correct, because ‘many more’ means ‘an increase in the number’. Option (a) is incorrect, because ‘much’ is used in cases of uncountable nouns. Option (c) is incorrect, because ‘too many more’ refers to a huge number of amendments, and we have already explained that it’s not what the statement refers to. Option (d) is incorrect, because ‘quite’ refers to the ‘degree’ or ‘intensity’, so it is saying that there will be very few more amendments, which is not what the author intends.
The correct word is filled in the above given sentence :-
The present Constitution will see much more amendments but its basic structure will survive.