Shown are selected data from the 2015 annual report of CVS Health, a large drugstore chain. (Dollar amounts are in millions.)

a. Compute for the year CVS Health's return on average total assets. (Round computations to the nearest two-tenths of 1 percent.)
b. Compute for the year CVS Health's return on average total stockholders' equity. (Round computations to the nearest two-tenths of 1 percent.)
c. What is the most likely explanation why CVS Health's total stockholders' equity for the year decreased?

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Beginning of the Year End of the Year $74,187$93,657 37,203 9,454 5,239 37,963 ....