Is this a parallelism problem

[neerajbansal]

Scientists in Princeton have broken the speed barrier posed by light AND CAUSED A LIGHT PULSE TO TRAVEL AT MANY TIMES THE SPEED OF LIGHT.

(a)
(b) and have caused light pulses to travel at many times the speed of light.
(c) and has caused a light pulse to travel at many times the speed of light
(d) and caused light pulses to travel at many times the speed of light
(e) and have enabled a light pulse to travel at many times the speed of light


OA is
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a

[manjeet.singh]

A. Correct
B. Should not be light pulses as original sentence is talking about singular light and light pulse
C. Subj-Verb agreement issue. Should be have caused
D. light pulses should be light pulse
E. Meaning change. Original sentence says caused the light to do so and not enabling it

[joehurundas]

Option A says the "Scientists have broken...and caused..."
E: "Scientists have broken and have enabled..."
Besides the fact that E uses "enabled," is it grammatically wrong?

[jnelson0612]

Neeraj, please post the source and question number for the problem.

Thank you,