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Verbal·Expression of Ideas·Transitions

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Plant species known as metal hyperaccumulators can help remove heavy metal pollutants from soil. Sesbania drummondii, or rattlebush, for instance, can absorb a large quantity of cadmium and store it safely in its roots and shoots. __________ its roots may not reach far enough into the soil and could leave trace amounts of cadmium.

Which choice completes the text with the most logical transition?

A

Moreover, the plant is potentially useful in removing accumulated metals;

B

That said, the plant may not always be able to remove all of the pollutant;

C

On the contrary, a pollutant such as cadmium can be removed from the soil;

D

For this reason, the plant has useful applications in soil quality restoration;