[A]: Lateral-iine organs are important in con- nection with aquatic mode of life.
[R]: They are highly supplied with branches of cranial nerves and they are entirely disap- peared in terrestrial forms.
A. If both A and R are true and R is the correct explanation of A
B. If both A and R are true but R is not the correct explanation of A
C. If A is true and R is false
D. If both A and R are false