Which sentence is punctuated correctly

Your correct answer is the fourth: 'After they rested a few days, the aliens revived sufficiently to explore.'

The third sentence is punctuated correctly.

Explanation: "After they rested a few days" is an introductory phrase and also a surbodinate clause.

While "the aliens received sufficiently to explore" is the main clause.

And it is best to separate this kind of sentence with a comma.

from: "the tragedy of julius caesar by william shakespeare: act 1 "

the correct answer is:

act 1 opens with the forum in celebration and ends with it in chaos.

a) walter looks unhealthy