单项选择题

A. In the InitComplete event handler, set the Theme property of the Page object based on the user profile.
B. In the PreLoad event handler, set the Theme property of the Page object based on the user profile.
C. In the OnLoad event handler, set the Theme property of the Page object based on the user profile.
D. In the PreInit event handler, set the Theme property of the Page object based on the user profile.