How long must white "crianza" wine age for in total?

A white "crianza" wine is required to age for a total of 18 months, which includes a minimum of six months in oak barrels. This aging process is a hallmark of crianza wines in Spain, particularly in regions like Rioja. The aging in oak imparts complexity and potential flavors such as vanilla, spice, and tannin structure to the wine, while the remaining time in bottle allows for further integration and development of flavors. In contrast to other categories like "reserva" and "gran reserva," which require longer aging periods, the 18-month standard for crianza balances youthful freshness with the characteristics developed from aging. Thus, option B accurately reflects the regulatory requirements for white crianza wines.