Regarding 2;
In most jet aircraft (having operated Boeing and Airbus), the definition for the need for ENGINE anti-ice is +10oC or less, visible moisture or vis less than 1500m. It's also common practise to switch on the ignitors for take-off and whenever ENGINE anti-ice is selected because of the reduced flow/increased risk of flame-out.
In my experience, AIRFRAME anti-ice is a no-no whenever on the ground unless you wish to melt the wings. (I'm sure it says in the MEL that melted wings are a no go item.)
So I think the closest is B
Regarding 4;
SFC is will increase (i.e. get worse)
EGT will increase as their is less flow through the combustion chamber
EPR will decrease because airflow is lost via the bleed system.
Regarding 3;
The previous poster is correct, 'small' amounts of frost in the vicinity of the fuel tanks are allowed BUT the question doesn't say that so I'd be cautious and say A.