Javier uses 1 teaspoon of nutmeg for each loaf of banana bread he makes. If he has 4 teaspoons of nutmeg, he can make 4 loaves of banana bread. Therefore, with 1 teaspoon of nutmeg, he can make 1/4 of that amount, which is 1 loaf. Since the question states he can make 1 loaf with 1 teaspoon, the correct answer is 8 loaves with 4 teaspoons. This is derived from the unitary method, where you determine how many loaves can be made per teaspoon and then scale it up or down accordingly.