Answer: C. [tex]4(\dfrac13g-3)[/tex]
Step-by-step explanation:
Given: Robin braided g inches of a friendship bracelet.
Number of inches braided by Olivia = [tex]\dfrac13g-12[/tex]
The total number of inches braided by Robin and Olivia = Number of inches braided by Robin + Number of inches braided by Olivia
[tex]=g+\dfrac13g-12\\\\=\dfrac43g-12\\\\\=4(\dfrac13g-3)[/tex]
The total number of inches braided by Robin and Olivia = [tex]4(\dfrac13g-3)[/tex]
Hence, C. is the correct option.