Select the most appropriate set of words from the given choices to fill in the blanks.

A growing number of these expert professionals ___________ having to train foreigners as the students end up ___________ the teachers who have to then unhappily content with no jobs at all or new jobs with drastically reduced pay packets

A. are, supplanting

B. welcome, assisting

C. resist, challenging

D. resent, replacing

Please do not use chat terms. Example: avoid using "grt" instead of "great".