NTG be an aid to Stop a Heart Attack?

Question : Heart attack occurs due to :

Option 1: Bacterial attack on the heart

Option 2: Stopping of heart beat

Option 3: Lack of blood supply to the heart itself

Option 4: Impairment of heart's working due to unkhown reasons

Question : Heart attack occurs due to

Option 1: bacterial attack on the heart

Option 2: stopping of heart beat

Option 3: lack of supply of blood to the heart itself

Option 4: impairment of heart's working due to unknown reasons

Question : Select the grammatically correct sentence.
A.Debraj had a heart attack. His ancestral property helped him lot to bear expenses during this crisis.
B.Debraj had heart attack. His ancestral property helped him lot to bear expenses during this crisis.
C.Debraj had a heart attack. His ancestral property helped him a lot to bear expenses during this crisis.
D.Debraj had heart attack. His ancestral property helped him a lot to bear expenses during this crisis.

Option 1: B

Option 2: A

Option 3: C

Option 4: D