39. What is identified as the major challenge for adopting vertical farming?
(A) The lack of available shipping containers in cities.
(B) The high energy consumption and expensive initial setup costs.
(C) The poor taste and low nutritional value of the vegetables produced.
(D) The severe shortage of water resources in most urban areas.

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統計： A(0), B(1), C(0), D(0), E(0) #4070182