A long-term trend in U.S. companies is that ________. Select one:
a. firms are increasing their investments in current assets relative to total assets, and most of this increase has occurred as firms increase their cash holdings
b. firms are decreasing their investments in current assets relative to total assets, and most of this decrease has occurred as firms decrease their cash holdings
c. firms are increasing their investments in current assets relative to total assets, and most of this increase has occurred as firms increase their inventory balances
d. firms are decreasing their investments in current assets relative to total assets, and most of this decrease has occurred as firms decrease their inventory balances
