which sentence is punctuated correctly?\no the aliens suffered from exhaustion, after traveling several…

Answer:

After they rested a few days, the aliens revived sufficiently to explore.

Brief Explanations:

In the first option, the comma after "exhaustion" is incorrect as the dependent - clause "after traveling several light years" should come before the independent clause. In the second option, the comma after "relaxation" is wrong as the dependent - clause "when they finally landed their spaceship" should follow the independent clause. In the fourth option, the comma after "energy" is incorrect as the dependent - clause "once they started hiking the rough terrain" should come after the independent clause. The third option has the correct punctuation with the dependent - clause "After they rested a few days" at the start, separated from the independent clause by a comma.