Sample space of the given events contain all the possible outcomes of the event. Cardinality of a set is defined as the number of elements in that set.
For Event A:
The sample space comprises all the 52 outcomes of cards in the deck.
So cardinality of event A = n(A) = 52
For Event B:
The sample space comprises all the 6 outcomes of rolling a dice.
So cardinalty of event B = n(B) = 6
The difference in two is 52 - 6 = 46
So, we can conclude that the cardinality of sample space of event A is 46 more than the event B's sample space.
Thus the correct answer is option A