During the School Year, the Achievement Test Scores of Low-SES

During the school year, the achievement test scores of low-SES children tend to _____; during the summer, their scores tend to _____.

A) remain constant while those of high-SES children rise; drop or remain constant while those of high-SES children rise
B) rise similarly to those of high-SES children; drop while those of high-SES children remain constant
C) remain constant while those of high-SES children rise; drop while those of high-SES children remain constant
D) rise similarly to those of high-SES children; drop or remain constant while those of high-SES children rise