The correct option is
B Work
'My feeling is that co-operatives, whether in selling, purchasing or distributing should be restricted to carry on their operations for and among their members only.' Here, 'operation' means the way the company works.
Option A - 'A surgical procedure' means a medical operation procedure. Thus option A is incorrect.
Option C - 'Management' means the control and organisation of a company. Here, the word 'operation' doesn't refer to a specific branch of work i.e., 'management', it refers to a general task or a work. Thus option C is incorrect.
Option D - 'A large amount of money' doesn't mean work or operation. Thus option D is incorrect.
Option B - 'Work' means task or something that people do for their living. Thus option B is the orrect answer.
The word 'operation' in the passage means 'work'.