By the late 1940s, ENIAC, the first electronic digital computer was able to compute a ballistics trajectory in about 30

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By the late 1940s, ENIAC, the first electronic digital computer was able to compute a ballistics trajectory in about 30 seconds, and it was much less time than the 20 hours required to perform the same calculations with a desk calculator.

A. computer was able to compute a ballistics trajectory in about 30 seconds, and it was
B. computer, which was able to compute a ballistics trajectory in about 30 seconds, was
C. computer, was able to compute ballistics trajectory in about 30 seconds,
D. computer was able to compute a ballistics trajectory in about 30 seconds, being
E. computer, and was to compute ballistics trajectory in about 30 seconds, and was



OA C

Source: Princeton Review

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ENIAC is the subject here. By the late 1940s, ENIAC, the first electronic digital computer, was able to compute...
The first electronic... is a modifier.

Option A - incorrect
Here, 'Computer' is supposed to be a modifier, but it's taking the action 'was' which changes the meaning of the sentence.

Option B - incorrect
'Was' which after the second comma modifies the wrong subject. This causes a change in the meaning of the sentence.

Option C - correct
The subject 'ENIAC' and verb 'was' are used correctly. Also, the modifier 'the first electronic digital computer' modifies appropriately. Hence, the answer choice is correct!

Option D - incorrect
This has the same issue as option A. 'being' used in the sentence is incorrect. Hence, it gives the sentence a wrong impression.

Option E - incorrect
Using the phrase 'and was' is wrong because it gives the sentence an incorrect representation of the intended meaning.