yes understandable beep boop
What do you mean what happend
Answer:
A A catastrophe is any event that is unexpected
A progressive form of a verb is formed with the ending "-in": the only verb form in the options that is formed with the ending "ing" is in option b.
The correct option is b: will have been falling. This tense is the future perfect progressive tense.
ITS B because it’s none of the other answers