Correct option is B
The correct option is
(b) a mild and.
Explanation: "Mild" is an adjective and should be used before "peace-loving" to describe the nature of the hippopotamus. "Mildly" is an adverb and does not fit in this context. Therefore, the correct phrase is "a mild and peace-loving animal."
Corrected sentence: "The hippopotamus is
a mild and peace-loving animal."