According to paragraph 3, what is the advantage of hydroponics for research on nutrient de

According to paragraph 3, what is the advantage of hydroponics for research on nutrient deficiencies in plants？

A．It allows researchers to control what nutrients a plant receives.

B．It allows researchers to observe the growth of a large number of plants simultaneously.

C．It is possible to directly observe the roots of plants.

D．It is unnecessary to keep misting plants with nutrient solutions.

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