Surely you are referring to an option other than option C, because option C is not wrong.

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OA D

Could not understand the flaw in option c. Could you please elaborate your explanaton.

It's going to be hard to elaborate on what you generously call my "explanation" of the flaw in option C, because there is no flaw in option C! So I can't explain anything! Are you quite sure that you are looking at the Official Answer for this question and not another? You say that the OA is option D, but this is impossible, because D has a number of mistakes.

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Oops!..
Sorry my bad.
I mistakenly interchanged the OA and my answer.

OA C

Could you please point out the flaws in each option?

Using the simplest decision-point in each option, you could approach the question in this way:

1. In the given sentence, EXCITED WITH is unidiomatic. The correct form is EXCITED ABOUT. Whenever you identify a mistake, you should look for its repetition in another option. Proceeding in this way would allow you to eliminate options A and E.

2. Option B has a simple grammatical error: the subject is PROSPECTS, but the verb of which that noun is the subject is singular: WAS. This should be WERE.

3. You could knock out D on the grounds that EXCITED ... AND PREDICTED is a false parallel. EXCITED works here as an adjective describing Nikola Tesla; PREDICTED, on the other hand, is a verb. Given that it is a verb, what is its subject? It can only be Nicola Tesla, but the clumsy construction of the option leaves unclear what any good option must make perfectly clear.
Look, by way of contrast, at the way the correct answer is constructed: EXCITED ..., NIKOLA TESLA ... PREDICTED at a certain time that something would happen. The phrases and clauses are all in a logical relation to one another and create a logical sequence of ideas - and logical sequences of ideas are what the GMAT is principally interested in.

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Hi Fabio ,

All clear , but can you please explain the use COMMA + HE in option A is right or not. If yes or no , then please explain.

Many thanks in advance.

SJ

Nikola Tesla, the inventor of alternating current, because he was excited with the prospects of harnessing Niagara Falls for producing electric power, he predicted ...

1. The structure NIKOLA TESLA ... HE PREDICTED introduces the subject of the main clause (the part of the sentence after HE) twice: first as a proper noun, and then as a pronoun. This is not a correct structure in English. It should be NIKOLA TESLA ... PREDICTED.

2. The comma that appears before HE is correct and would have to be used regardless of whether the sentence used or omitted the pronoun. This is because before HE there is a dependent clause: because he was excited ... This dependent clause then leads into the main clause, and must therefore be separated from it by a comma.

Here is an example: Because she did not want to be exhibited as a trophy in Rome, Cleopatra committed suicide.

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