A seamstress has one-fourth of a foot of thread. Then she uses one-fifth of a foot of thread to sew a hole. How much of the thread is left?
A. start fraction 9 over 20 end fractionof a foot
B. Start Fraction 3 over 20 End Fraction of a foot
C. start fraction 1 over 20 end fractionof a foot
D. Start Fraction 1 over 16 End Fractionof a foot