Analysis Quizzes Continuous Pattern Series

Question:
What comes in place of question mark (?) in the following number series?

336, 168, 84, 42, 21, ?

Option A):
10.5
Option B):
17
Option C):
14.5
Option D):
15

Correct Answer is Option A):
10.5

Explanation:
In the given series, previous element is divided by 2 to get the next element.