Choose the best description of the effects of diabetes mellitus on blood glucose levels. A) Increased production of or increased sensitivity to insulin, causing the cells to absorb excessive glucose B) Increased production of or increased sensitivity to insulin, causing the cells to be unable to absorb glucose C) Decreased production of or reduced sensitivity to insulin, causing the cells to be unable to absorb glucose D) Decreased production of or reduced sensitivity to insulin, causing the cells to absorb excessive glucose