What elevation zone is best suited for growing bananas and sugarcane?

Tierra Caliente

Explanation:

The elevation zone that is best suited for growing bananas and sugarcane is Tierra Caliente because bananas and sugarcane do well in a hot climate. Tierra Caliente is also a good elevation zone to grow bamboo as well. bamboo grows well there for the same reasons that bananas and sugar cane do  :)

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d. new methods of assembly are introduced.

explanation:

this allows for the goods to be made on a larger scale. not faster because now it is shown to be made better, hence the greater productivity in the question. it is calling for something new to be introduced.