GMAT Sentence Correction (SC) | In January 1994 an oil barge ran aground off the coast of

In January 1994 an oil barge ran aground off the coast of San Juan, Puerto Rico,leaking its cargo of 750000 gallons into the ocean, while causing the pollution of the city's beaches.

*The intended meaning of the sentence is to point out 2 different events:

1st event = Ran aground off the coast
2nd event = leaked into the ocean

So any choices that indicate these 2 events are RELATED TO each other are WRONG (A)

*The 2nd event leads to reasonable consequence = polluting
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