[A] : In lower invertebrates the digestion is intracellular while in higher forms it is extracellular .
[R] : Extracellular digestion is highly evolved process , it takes place in gut .

Options

A. 1)If both A and R are true and R is the correct explanation of A
B. 2)If both A and R are true but R is not the correct explanation of A
C. 3)If A is true and R is false
D. 4)If both A and R are false

Answer

A