Lately, Christina has been battling vertigo, but she's keeping it a secret from everybody. The dizziness comes upon her all of a sudden, usually when she is descending a particularly steep staircase. She's too proud to go to the doctor, though. She says that she prefers to not be a burden on others.
Select the word that offers the best synonym for vertigo.
A. descending
B. burden
C. secret
D. dizziness