For a medication to be maintained at the proper blood level, it must be given
a. by the right route
b. in the right dose
c. at the right time
d. in the right drug

For a medication to be maintained at the proper blood level, it must be given at the right time. The correct option among all the options that are given in the question is the third option or option "c". Timing of the medication is of immense importance and this will help to get to the right kind of result for the patient.

Bwould be my guess |-/ 

The correct answer is:   [b]:   "physical systems" .