In an experimental study using randomly assigned participant groups, what is the most accurate interpretation of results showing p<.01 and an effect size of .05? At the population level, the difference in means is probably

A. larger than zero but too small to be clinically meaningful
B. no larger than zero but large enough to be clinically meaningful
C. larger than zero but too small to be clinically meaningful
D. no larger than zero but large enough to be clinically meaningful