The National Common Core Standards Have Been Adopted by Many

The national Common Core Standards have been adopted by many states.Why might implementation pose problems for teachers,students,and schools?

A) Council of Chief State School Officers (CCSSO) and the National Governors Association Center for Best Practices (NGA Center) disagree on standards.
B) The high expectations of the Common Core Standards do not match current curricula and texts.
C) Common Core Standards do not state clear,understandable,and consistent goals.
D) Common Core Standards are not based on research and will not help students compete in a global context.