Results of Research Studying Carnitine Supplementation as an Ergogenic Aid

Results of research studying carnitine supplementation as an ergogenic aid showed that it

A) does not seem to increase fat oxidation.
B) enhanced carbohydrate oxidation rate but not fat oxidation.
C) raised muscle carnitine concentration but did not improve performance.
D) promoted retention of amino acids but did not lead to increased muscle mass.
E) increases ATP and improves performance.