"Overall, Arabica beans represent around 56% of the coffee beans sold" -> More than half of coffee sold is Arabica
-> Option 1: Coffea Canephora (Robusta) - Not the most sold
-> Option 2: Coffea Arabica - 56% of coffee beans sold ✓
-> Option 3: Coffea Eugenioides - "not widely cultivated"
-> Option 4: A blend - While blends exist, the question asks for single variety
The answer is Option 2 - Coffea Arabica.