There is a widespread belief in the United States and Western Europe that young people have a smaller commitment to work and a career than their parents and grandparents and that the source of the change lies in the collapse of the "work ethic."
a smaller commitment to work and a career than their parents and grandparents
less of a commitment to work and a career than their parents and grandparents
a smaller commitment to work and a career than that of their parents and grandparents
less of a commitment to work and a career than their parents and grandparents had
a lessening of the commitment to work and a career that their parents and grandparents had
Much more importantly, "smaller" vs. "less of a" is there just to distract you. You don't actually need it to solve the problem.
* You can eliminate a/b/c because the comparison has two possible meanings: (1) commitment to work vs. commitment to family, or (2) young people's commitment to work vs. their parents' and grandparents' commitment to work.
* You can eliminate E because "than" is there without "less".
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