according to invesp, 80% of sales require how many follow - up calls?\n2\n3\n4\n5\n6

according to invesp, 80% of sales require how many follow - up calls?\n2\n3\n4\n5\n6
Answer
Brief Explanations:
This is a knowledge - based question in the field of business (sales). According to common sales knowledge from Invesp, 80% of sales require 5 follow - up calls.
Answer:
D. 5