Sentence Correction

This April, three out of seven people will file tax returns with a disk found in software stores and accounting texts.
A.tax returns with a disk found in software stores and accounting texts
B.a tax return with a disk found in software stores and accounting texts
C.tax returns with disks found in software store and an accounting texts
D.tax returns with a disk found in software store and an accounting texts
E.a tax return with a disk found in software store and an accounting texts

OA is B