Assertion A : Marine structures are made specially bulky and strong.Reason R : Sea insects result in undermining of the hardest and the soundest building material. Select your answer based on the coding system given below: Both A and R are true but R is not the correct explanation of A. A is false but R is true. Both A and R are true and R is the correct explanation of A. A is true but R is false. TRUE ANSWER : ? YOUR ANSWER : ?