Final answer:
The standard expiration period for Frappuccino syrup base is 18 months (C).
Step-by-step explanation:
The standard expiration period for Frappuccino syrup base is 18 months (C). This means that the syrup base is considered to be of good quality and safe to consume up to 18 months from the date of manufacture. After this period, the quality and taste of the syrup base may start to deteriorate.