Mashaal Masha
The Lion Light system, developed by Kenyan inventor Richard Turrere, consists of LED lights installed around the perimeter of livestock pastures. Powered with ________ the blinking LEDs keep lions away at night, thus protecting the livestock without risking harm to the endangered lions.

Which choice completes the text so that it conforms to the conventions of Standard English?
Difficulty: Medium
A: 

energy collected, by solar panels, during the day

B: 

energy collected by solar panels during the day

C: 

energy collected by solar panels during the day,

D: 

energy, collected by solar panels during the day,

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