Digital SAT Reading and Writing Test 3 Question 14

Conventional wisdom has it that the increasing number of alien marine species in coastal areas is due to the ballast water of ocean-going ships from maritime trade. However, a group of scientists recently discovered that stranded debris in the water, such as bottles and plastic bags, floats long distances to different parts of the ocean while various marine species attach themselves to them. This discovery may indicate that _____

Which choice most logically completes the text?

stranded debris in the water also contributes to the growth of alien marine species in coastal areas.
stranded debris must have contributed to the growth of alien marine species much earlier than maritime trade.
the coastal areas would not have an invasive species problem without any stranded debris.
the growing number of alien marine species could be solely attributed to the maritime trade.

14/14

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