Final answer:
Magnesium Sulfate can be administered intravenously for cardiac arrest involving torsades or hypomagnesemia.
Step-by-step explanation:
In cardiac arrest involving torsades or hypomagnesemia, Magnesium Sulfate can be administered intravenously at a dosage of 1-2 g over 5 to 60 minutes (option B). This helps to replenish magnesium levels in the body and potentially stabilize the heart rhythm.