With Respect to Firm Size and Job Tenure,union Membership Rates

With respect to firm size and job tenure,union membership rates are much higher for those who

A) work for small or medium- sized firms and have long job tenure.
B) work for small or medium- sized firms and have short job tenure.
C) work for large firms and have long job tenure.
D) work for large firms and have short job tenure.
E) work for large firms and have medium job tenure.