Standards that represent levels of operation that can be attained with reasonable effort are called a. ideal standards b. theoretical standards c. normal standards d. variable standards

 c. Normal standards

Step-by-step explanation:-

Hence, Standards that represent levels of operation that can be attained with reasonable effort are called normal standards .

but which class are u may know that first

easy its decreasing

step-by-step explanation:

because its top point is at the to of the graph on the left side (atleast from the veiw i see it) now if that top point wast in the lower part of the graph it would be increasing hope this have a nice day