1. 

Statements: All fish are tortoise. No tortoise is a crocodile.

Conclusions:

I.  No crocodile is a fish.

II. No fish is a crocodile.

A. Only conclusion I follows
B. Only conclusion II follows
C. Either I or II follows
D. Neither I nor II follows
E. Both I and II follow

Answer: Option E

Explanation:

Since both the premises are universal and one premise is negative, the conclusion must be universal negative. Also, the conclusion should not contain the middle term. So, II follows; I is the converse of II and thus it also holds.