When Francesca Took the ACT Assessment This Year,she Was Allowed

When Francesca took the ACT Assessment this year,she was allowed to use a graphing calculator on the mathematics portion of the exam.Her older sister is surprised,because when she took the test six years ago,calculators were not allowed for any portion of the exam.This suggests that

A) it would be difficult to meaningfully compare Francesca's score with the score her sister obtained.
B) Francesca probably earned a higher score on the exam than her sister did.
C) the current form of the ACT Assessment has poor construct validity.
D) Francesca's score is probably less reliable than her sister's score.