Kira is making ribbon braclets. She makes 4 bracelets on Thursday and 3 braclets on Friday. She use 5/6 yard of ribbon for each bracelet. Which of the following equations can Kira use to find how much ribbon she used?
a. (4 x 5/6) + (3 x 5/6) = r
b. 5/6 x (4 + 3) = r
c. (4 + 5/6) + (3 + 5/6) = r
d. (4 x 5/6) x (3 x 5/6) = r
e. (7 x 5/6) = r