D, while numbers is the answer
Answer:

Step-by-step explanation:
Given

Required
Find 
From the attachment:
The measure of
is calculated using the following expression:

Where
-- right-angled.
The expression becomes



The answer is 64, because the amount is doubled each day.
HMMMMMMM...It could be C...
An Arc is the the end of the circle, the OUTER rim..do you get what I'm trying to say? SO, if you look at AC, it looks like an arc.
Hope this helps!