The correct option will be : 14 years
<u><em>Explanation</em></u>
Current account balance of Susan is $1,336.60 and her initial deposit was $820
So, the amount of interest earned
dollar
Formula for Simple Interest is:
, where
is the amount of interest,
is the initial amount,
is the rate of interest in decimal and
is the time duration in years.
Here,
% 
Now according to the above formula, we will get...

So, Susan has held the account for 14 years.