What does this excerpt from Shakespeare’s Twelfth Night imply about Olivia?

VALENTINE: So please my lord, I might not be admitted,
But from her handmaid do return this
The element itself, till seven years' heat,
Shall not behold her face at ample view;
But like a cloistress she will veiled walk,
And water once a-day her chamber round
With eye-offending brine: all this to season
A brother's dead love, which she would keep fresh
And lasting in her sad remembrance.

A.
Olivia has decided to join a nunnery and give up all material attachments.
B.
Olivia has decided to cut herself off from all social interactions.
C.
Olivia has decided to keep her brother’s memory alive by weeping continually.
D.
Olivia has decided to remain single and not take a suitor.

I believe it is either A or B.
It is not C, I used that answer and it is wrong.

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