Answer:
d. Stressing that younger staff members have no problem e-mailing their reports.
Step-by-step explanation:
Option A - If sales manager provides all the required hardware, software, and training, it can be the best effective way to change other staffs' motives.
Option B - If sales manager explains the importance of electronic submissions, it should be the best way of winning over those who are resist to change.
Option C - If sales manager praises other staff members, those who do not want to change will change their motive and send electronically.
Therefore, all the options A, B, and C are the best effective ways, so, D is the best option which is least likely way to change.