How is the fraction decomposed in the fraction model? (3 points)
A fraction strip partitioned into eight parts. The first part is shaded blue. The second, third, and fourth parts are shaded orange, the fifth and sixth parts are shaded green, and the seventh part is shaded red. Below is the fraction seven eighths.
a two eighths plus two eighths plus two eighths plus one eighth
b one eighth plus two eighths plus two eighths plus four eighths
c one eighth plus three eighths plus two eighths plus one eighth
d three eighths plus one eighth plus two eighths plus three eighths