Like the training of stained glass workers, whose apprenticeships take years to complete, other artisans learning to perfect their craft must make a major commitment of their time.
A Like the training of stained glass workers, whose apprenticeships take years to complete
(training compared with other artisans, incorrect)B While the training of stained glass workers, an apprenticeship that takes years of preparation (
same as in A, incorrect)
C Like stained glass workers, whose apprenticeships take years to complete (
Correctly compares glass workers with other artisans)
D Similar to stained glass workers, preparing for years in an apprenticeship (
Incorrect, Like is used to show comparison between nouns, here glass workers and artisans are both nouns)
E Like that of stained glass workers, whose apprenticeship takes years (
that refers to what?, ambiguity, better to strike it out)