In costa rica, coffee, from the highlands, and bananas, produced mainly in the caribbean lowlands, as the most important crops, they account for nearly half the total value of all exports.
(a) as the most important crops, they account
(b) as the most important crops, which account
(c) are the most important crops, accounting
(d) are the most important of their crops by accounting
(e) have been the most important crops, which accounts