Mashaal Masha
In 1881, French chemist Camille Faure redesigned the rechargeable lead-acid battery. Faure’s design greatly increased the amount of electricity that the original battery, which the French physicist Gaston Planté ________ fifteen years earlier, could hold.
Which choice completes the text so that it conforms to the conventions of Standard English?
Difficulty: Easy
A: 

is inventing

B: 

will invent

C: 

invents

D: 

had invented

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