Step 1: Understanding the Concept
Birds save water by excreting nitrogen as insoluble uric acid, so they are uricotelic.
Step 2: Find A, B and C
A is uric acid. It is formed in the liver (B). The route is the inosinic acid pathway (C).
Step 3: Why the others fail
The urea (ornithine) cycle is used by ureotelic animals. Pancreas and the Krebs cycle are not involved in uric acid formation.
Final Answer:
A is uric acid, B is liver and C is inosinic acid pathway.
\[ \boxed{\text{(D) }\text{A- uric acid, B-liver and C-inosinic acid pathway}} \]