Answer:
Allied bombing raids destroyed many German jets while the jets were still on the ground.
Explanation:
The primary sentence was
Allied bombing jets destroyed many German jets, and the jets were still on the ground.
First option uses 'yet' which is not compatible with the sentence.
Second option is more like a passive voice but not correct revision of the original sentence too.
Third option is also wrong as its construction is wrong.
The correct revised version of the original sentence is the last option with the use of 'while' which suggests that the bombing happened at the same time as the jets were on the ground.
Allied bombing raids destroyed many German jets <u><em>while</em></u> the jets were still on the ground.
