In which year did Albert Einstein predict a new state of

In the following question, out of the four alternatives, select the alternative which best expresses the meaning of the idiom/phrase. 

I'm sure you understand that we can't have a mere inspector still wet behind the ears running a case of this importance.

Select the most appropriate meaning of the given idiom

Go down like a lead balloon

Get cold feet

The aged employees were offered a golden handshake by the management.

The fact that the guard was a thin man considerably shorter than Walker made the task seem like a catwalk .

"After trying everything to fix the computer, John was at his wits' end and didn’t know what to do next."

When two heavyweights have an argument, its best to  sit on the fence  and not make either of the turn against you. 

Select the most appropriate meaning of the bold idiom.