In the sentence, the pronoun it has an ambiguous antecedent. When Luke dropped the glass on the table, it cracked.
Which version of the sentence is most clear?
A. Luke dropped the glass on the table, and it cracked.
It cracked when Luke B. dropped the glass on the table.
C. When the glass was dropped on the table, Luke cracked it.
D. The glass cracked when Luke dropped it on the table.

I believe it's D. The glass cracked when Luke dropped it on the table.

Explanation:

The reason why I think it's D. is because, it makes more sense than the sentence we started with, we know what has cracked and who has dropped it.

its D  i did the quiz and got 100%

Explanation:

two jet streams that directly affect the formation of weather in the continental part are a polar jet and a subtropical jet. they are responsible for the transportation of weather systems, which directly affect people. the polar front is the boundary between cold air from the north pole and warmer equatorial air. both the polar jet and the subtropical jet blow from the west to the east, and follow the boundary between cold and warm air.

the strongest jet streams are polar jets, while subtropical jets are somewhat weaker.

the right answer is c. the polar jet stream is generaly stronger than the subtropical jet stream.