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?
Choose 1 answer:
Choose 1 answer:
(Choice A) is inventing
A
is inventing
(Choice B) will invent
B
will invent
(Choice C) had invented
C
had invented
(Choice D) invents
D
invents

(Choice C) had invented