Which Statement Best Describes How U

Which statement best describes how U.S. students are achieving in science on the NAEP?

A) There has been steady progress except at the 12^th grade level.
B) It is impossible to say because the test was changed and comparisons can no longer be made from previous versions of the test.
C) There has been little improvement in science achievement.
D) Our science scores place U.S. students at the bottom of other countries assessed on the NAEP.