The boba that John drinks during weekdays: $$5x$$  The boba that John drinks during weekends: $$2\times 2 =4$$  The total boba that John drinks during a week: $$5x+4$$ 
Which of the following equations represents the situation: John drinks $x$ cups of boba everyday on weekdays and $2$ cups of boba everyday on the weekends. 
Options:
a. $x+2$ 
b. $5x+2$ 
c. $5x+4$ 
d. $5x-4$ 