Final answer:
The ageing period required for the Riserva versions of Barolo is 62 months, Barbaresco is 50 months, Gattinara is 47 months, and Amarone della Valpolicella is 24 months, with specific requirements for wood barrel ageing for some. None of the options are correct.
Step-by-step explanation:
The minimum ageing period for the Riserva version of specific DOCG wines is as follows:
- Barolo: 62 months (of which 18 must be in wood barrels)
- Barbaresco: 50 months (of which 9 must be in wood barrels)
- Gattinara: 47 months (of which 24 must be in wood barrels)
- Amarone della Valpolicella: 24 months
Therefore, none of the multiple-choice options A (24 months), B (30 months), or C (36 months) accurately reflects the ageing requirements for all these wines. Each wine has its own specific ageing requirements before it can be labeled as Riserva.