Decompose the fraction represented in the model into the sum of its unit fractions. (3 points)

a fraction strip partitioned into eight parts with two parts shaded
a


one eighth plus one eighth equals two eighths
b


one eighth plus one eighth plus one eighth plus one eighth equals four eighths
c


one eighth plus one eighth plus one eighth plus one eighth plus one eighth equals five eighths
d


one eighth plus one eighth plus one eighth plus one eighth plus one eighth plus one eighth equals six eighths