If Crusade affects a 2/2 black creature turned white, what will its power and toughness be?

When evaluating the effect of Crusade, it’s important to understand how it interacts with creatures that change color. Crusade states that "White creatures get +1/+1." If a black creature is turned white, it becomes a white creature and will gain the bonus from Crusade.

In this case, if you start with a 2/2 black creature, and then it is turned white, it becomes eligible for Crusade's effect. Therefore, the creature receives a +1/+1 bonus, raising its power and toughness from 2/2 to 3/3. This accurately reflects the interaction between Crusade and the newly white creature, confirming that the final result is indeed a 3/3.

Other possible options do not reflect the correct application of Crusade’s effect or the transformation of the creature from black to white. Hence, the correct answer is that the creature's power and toughness will be 3/3 after applying Crusade's effect.