Final answer:
Gold tequila generally gets its color from the addition of caramel coloring. Aging in oak barrels can also impart a golden hue, but this is usually associated with reposado or anejo tequilas.
Step-by-step explanation:
Gold tequila derives its color primarily from the addition of caramel coloring, making option 3) the addition of caramel coloring the correct answer. While aging tequila in oak barrels can impart a golden hue to the spirit, this typically pertains to reposado or anejo tequilas, which are aged for specific periods according to regulatory standards. Gold tequilas, especially those that are not aged for a long period, often have caramel coloring added to achieve their gold appearance.