Borderless organisation approach was pioneered by
A. Bruce Tuckman
B. David McClelland
C. Jack Welch
D. Victor Vroom
E. Ronald Heifetz

C. Jack Welch

Explanation:
Jack Welch, the former CEO of General Electric, pioneered the concept of a borderless organization. This approach eliminates internal barriers between departments and divisions, promoting better communication and collaboration within the company.