Article 352 of the Constitution of India relates to proclamation of Emergency. After amendment of this provision, the grounds available to the President for proclaiming emergency are "war, external aggression or armed rebellion". Prior to the Constitution (Forty-fourth Amendment) Act of 1978, when could emergency under this provision be declared?

A. "War, external aggression or civil strife"

B. "Failure of constitutional machinery"

C. "War, external aggression or internal disturbance"

D. "Political or financial instability"

Answer: Option C