Why did Viola dressed as a man your opinion

In Twelfth Night, Viola dresses as the male Cesario in order to gain entry into Orsino's court. In Elizabethan England, women were not allowed to act professionally, and female parts were all performed by men, so Viola would have actually been played by a male actor, dressing as a woman dressing as a man. Let me know if this helped

Iam pretty sure the answer is c