The answer is variant D ----> the appositive developed phrase
I believe this is a dependant clause
Answer:
“‘Laugh and fear not, creatures. Now that you are no longer dum and witless, you need not always be grave. For jokes as well as justice come in with speech.’
It is 2, failure..debacle means failure or fiasco and he is basically saying that he left russia due to the failure or fiasco in russia.