Possitive degree:
(a) No other metal is as heavy as lead.
Comparative degree :
(b) Lead is heavier than any other metal.
Answer options:

The correct answer is Option C (Both (a) and (b) are correct).

Key Points:
• Transformation of Degrees of Comparison involving the superlative concept 'Lead is the heaviest of all metals'.
• Sentence (a): In the Positive degree, the formula 'No other + singular noun + is as + positive adjective + as + subject' gives 'No other metal is as heavy as lead', which is grammatically sound.
• Sentence (b): In the Comparative degree, the formula 'Subject + comparative adjective + than any other + singular noun' gives 'Lead is heavier than any other metal', which correctly excludes the subject itself using 'any other'.
• Thus, both sentences are correctly transformed and grammatically accurate.
• Key Takeaway: 'No other metal is as heavy as lead' (Positive) transforms to 'Lead is heavier than any other metal' (Comparative).