Hi !!
That book is .... of all
A- The less important => False it's a comparative form
B- Important = false
C- The More important => false. comparative form should be the most important
D- the least important = CORRECT
E- The important => false
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You are asked a superlative
the most important
OR
the least important
"more + adjective + than" and "less + adjective + than "are comparative forms not superlative forms.
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have a nice day :)
