Which one is the superlative degree?

Degree মূলত ৩ প্রকারের। 
- Positive;
- Comparative;
- Superlative;

Adjective-এর যে রূপটি অনেকের মধ্যে তুলনা করতে ব্যবহৃত হয় তাকে Superlative Degree বলে।
- The superlative form of an adjective is used to show something has a quality to the greatest or least degree.
- Superlative Degree তে adjective এর আগে the বসে।
- Precious - positive.
- More precious - comparative.
- Most precious - superlative.

Example sentence: 
- Ritu is the tallest girl in the class.
- Canada is one of the coldest countries in the world.
- He is the best player on the team.

তাই, সঠিক উত্তর: Gold is one of the most precious metals.