Which of the Following Sequences for Uric Acid Catabolism Is $\to$

Multiple Choice

Which of the following sequences for uric acid catabolism is correct for marine invertebrates?

A) uric acid $\to$ allantoin $\to$ allantoic acid $\to$ urea $\to$ NH₄⁺
B) uric acid $\to$ allantoic acid $\to$ urea $\to$ NH₄⁺
C) uric acid $\to$ allantoin $\to$ urea $\to$ NH₄⁺
D) uric acid $\to$ allantoin $\to$ allantoic acid $\to$ urea
E) none of the above