Shayla is tracking the weight of the smallest puppy in a litter. Use the table to write a linear function that models the puppy's growth.
Week Weight in ounces
0 3
1 6
2 9
3 12
A. y = 3x + 3
B. y equals one third times x plus 3
C. y = 3x + 12
D. y equals one third times x plus 12