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Why answer is C and why not A. Works, sends, remains aren't they parallel can someone please help me with this?
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SevaAcharekar
Why is option C right?
C uses present participial phrase "sending electrical pulses to aid the brain", elaborating how/why the new device for aiding memory works like a common pacemaker.

This is quite a common use of such participial phrases. An official example:

As an actress and, more importantly, as a teacher of acting, Stella Adler was one of the most influential artists in the American theater, training several generations of actors whose ranks included Marlon Brando and Robert De Niro.

Again, present participial phrase "training several generations of actors" elaborates how/why Stella Adler was one of the most influential artists in the American theater.

p.s. Our book EducationAisle Sentence Correction Nirvana discusses present participial phrases, their application and examples in significant detail. If you or someone is interested, PM me your email-id; I can mail the corresponding section.
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