A recent study analyzing the effects of day care on the productivity of the employees at a machine-parts company showed astonishing results. Forty percent of those factories that had day care programs produced more than 20,000 machine parts annually, while only 10 percent of those factories that did not have day care programs produced over 20,000 machine parts annually. This shows that day care has a positive effect on a company's productivity.
The argument above relies on which of the following assumptions?a. At least 30 percent of those factories that do not have day care programs would now be producing over 20,000 machine parts annually if those factories had implemented day care programs.
b. The factories with day care programs and the factories without day care programs are similar in ways that affect the ability to produce a high volume of machine parts annually.
c. The factories that did not implement day care programs did so because their production level was so low that they could not afford to start new programs.
d. The factories with day care programs are better designed and more efficiently run than the factories without day care programs.
e. The factories without day care programs produce machine parts of a significantly higher quality than do the factories with day care programs.