If you could be a doll and help me, that would be wonderful :)

A study analyzed the average yearly salt intake in the United States from 2012 through 2017. The data is summarized in the table:

Year | Annual Salt Intake (grams)

2012 | 3,618

2013 | 3,646

2014 | 3,680

2015 | 3,716

2016 | 3,751

2017 | 3,790

The study found that the data after the year 2012 can be modeled by the function f(x) = 36.4x + 3,608, where x is the number of years since 2012 and f(x) is the total amount of salt ingested in grams. Describe the significance of 3,608.

A. The average amount of salt in grams used in 2013

B. The average amount of salt in grams used in 2012

C. An estimate of the average grams of salt used in 2013

D. An estimate of the average grams of salt used in 2012