Question

which choice completes the text so that it conforms to the conventions of standard english? orbiting more than 250 miles above earth, __________. choose 1 answer: a the international space stations service as a laboratory for studying the effects of microgravity on human health is unique b the effects of microgravity on human health are studied in a unique laboratory on the international space station c the international space station serves as a unique laboratory for studying the effects of microgravity on human health d human health and the effects of microgravity on it are studied in a unique laboratory on the international space station

Explanation:

The initial phrase "Orbiting more than 250 miles above Earth" is a dangling - modifier. The subject that is doing the orbiting should immediately follow the modifier. In this case, it is the International Space Station. Option A has a possessive form which makes the modifier not clearly attached to the subject. Option B and D have the effects or human health as the subjects after the modifier instead of the International Space Station. Option C correctly has the International Space Station follow the modifier and is grammatically correct.

Answer:

C. the International Space Station serves as a unique laboratory for studying the effects of microgravity on human health