A researcher designs a study to determine if an intervention will change participants' attitudes toward eating Hershey bars for breakfast

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A researcher designs a study to determine if an intervention will change participants' attitudes toward eating Hershey bars for breakfast. Assume the researcher has a previously validated instrument to measure the dependent variable (i.e., attitude toward eating Hershey bars for breakfast). The researcher takes two intact groups of adults: (1) one group working at a telemarketing firm (telemarketing group), and (2) another group working at a university's library (library group). 

The telemarketing group receives a three-hour class where the goal is to change their attitudes whereas the library group does not receive the three-hour class. And then, both groups take the attitude inventory. When the results are analyzed, however, there is no difference between the two groups regarding their attitudes toward eating Hershey bars.The inability to detect the intervention effects could result from the faulty study design.

 Which of the following strategy (strategies) can better improve the study design in terms of increasing the internal validity of the study?

a.To use same type of subjects and perform group randomization

b.To issue the attitude inventory both at the beginning of the study and after the intervention

c.To add another type of intervention for the telemarketing group. So in addition to a 3-hour class, there'll be also some hands-on activities. 

d.both (a) and (b)