What are the two main coffee varietals that account for over 80% of arabica coffee production?

The correct choice highlights Typica and Bourbon as the two main coffee varietals that account for over 80% of Arabica coffee production. These varietals are integral to the coffee industry due to their unique flavors, quality, and adaptability to different growing conditions.

Typica is one of the oldest Arabica coffee varietals and serves as a genetic base for many other coffee types. Known for its well-balanced flavor profile, it produces a medium body with pleasing acidity. Bourbon, originally discovered on the island of Bourbon (now Réunion), is celebrated for its sweetness and complex flavors. It tends to have a higher yield and can thrive at lower altitudes compared to Typica. The prominence of these varietals is a significant factor in the coffee market, as they form the foundation for numerous specialty coffees around the world.

The other choices refer to different relationships within coffee production but do not directly address the primary varietals that dominate Arabica coffee output. Robusta is another species altogether that accounts for a different market segment. Ethiopian and Colombian refer more to coffee-growing regions rather than varietals, while washed and natural describe processing methods rather than varietals. Thus, Typica and Bourbon clearly define the main contributors to Arabica production.