Answer:
A.

Explanation:
Given


Required
The valid UPC
First, the UPC is represented as:
UPC = ID followed by item number followed by the checksum
So, we have:

To calculate X (the checksum)
Add up digits at odd positions


Multiply by 3


Add up digits at even positions


Add the product and the sum of even



The last digit of the UPC is 9.
Hence, the UPC is:
