Kathrina has 2 blue ribbons on her hair.Now, it is said the 1/4 of her ribbon on her hair is blue.Therefore 2 = 1/4Now, realize that in 1 whole there are 4 1/4s, let me show you=> 1/4 + 1/4 + 1/4 + 1/4 = 4/4 or equals to 1Thus, we will be multiplying the number of ribbons by 4 to be able to find out how many ribbons are there in Kathrina's hair.=> 2 * 4 = 81/4 0f 8 is 2.Thus, we have the correct answer