In which sentence does the underlined adverb clause modify an adverb?

when the double eagle ii landed in paris, other balloonists who had planned to cross the atlantic cancelled their trip.

three men crossed the atlantic ocean in the double eagle ii in 1978.

some balloonists who had tried to cross the atlantic ocean disappeared before they were able to land.

the double eagle ii was a hot-air balloon that flew farther than other hot-air balloons.

In which sentence does the underlined adverb clause modify an adverb?

1. When the Double Eagle II landed in Paris, other balloonists who had planned to cross the Atlantic cancelled their trip.

2. Three men crossed the Atlantic Ocean in the Double Eagle II in 1978.

3. Some balloonists who had tried to cross the Atlantic Ocean disappeared before they were able to land.

4. The Double Eagle II was a hot-air balloon that flew farther than other hot-air balloons.

The adverb it modifies is "farther".  

All of the other sentences have clauses that modify verbs, not adverbs.

the characters in string all have major secrets that they strive to avoid revealing throughout the play.

"the monkey's paw" is a rare story in that the theme is actually stated in the story. sgt. maj. morris tells the whites that the old fakir who put the spell on the paw said, "fate rules people's lives and those who interfere with fate do so to their sorrow." the message is a warning, but mr. white doesn't believe it. even though sgt. maj. morris makes it clear that he tried wishing with unfortunate results and he tries to throw the paw on the fire,   mr. white makes a wish for 200 pounds only to find that he receives the money when herbert dies in a factory accident. according to the fakir, then, because mr. white had wished for something he should not have had, his son lost his life.

the second wish that mrs. white encourages him to make is for herbert's return--one week after his death. when the strange knocking begins at the door during the windy night, mr. white panicks, believing that the previously dead but still mangled herbert could have walked home from the cemetary and is now at the door. because he fears what his wife will find if she opens the door, mr. white makes his third wish--for the noise to stop.

therefore, he uses his three wishes and to his sorrow, loses his son and disappoints his wife, who fervently believed that their son was at the door. she wanted him back, regardless of his condition.

explanation: