1. 

Statements: All fishes are grey in colour. Some fishes are heavy.

Conclusions:

I.  All heavy fishes are grey in colour.

II. All light fishes are not grey in colour.

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 A

Explanation:

Since one premise is particular, the conclusion must be particular and should not contain the middle term. So, it follows that 'Some heavy things are grey in colour'. I is a cumulative result of this conclusion and the first premise. Thus, only I holds.