Statements:
1. All mangoes are golden in colour.
2. No golden-coloured things are cheap.
Conclusions:
I. All mangoes are cheap.
II. Golden-coloured mangoes are not cheap.
Step-by-step Solution:
The premises state that All mangoes are golden and No golden-coloured things are cheap. By combining these, we can deduce the exact opposite: no mangoes are cheap. Therefore, this conclusion is false.
This is a direct and valid conclusion. The premise "No golden-coloured things are cheap" applies to everything in that category. Since the first premise confirms that mangoes are indeed golden-coloured, it is necessarily true that they are not cheap.
Final Answer: The correct option is C. Only conclusion II follows.