Which of the following is an example of why irrational numbers are not closed under addition?
A
square root of 10 plus open paren negative square root of 10 close paren is equal to 0 , and 0 is not irrationalB
square root of 4 plus square root of 4 is equal to 2 plus 2 is equal to 4 , and 4 is not irrationalC
1 half plus 1 half is equal to 1 , and 1 is not irrationalD
negative 3 plus 3 is equal to 0 , and 0 is not irrational