The interaction of two drugs in such a way that the total effect is greater than the sum of the individual effects is called

this would and i think the answer is d

absolute strength refers to the maximum force exerted by a body irrespective of body size. relative strength on the other hand is the force exerted by a body in relation to muscle size or body weight.

so the answer is: c. absolute strength measures strength regardless of your body size, while relative strength measures strength adjusted for your weight.