Four of the following five are alike in a certain way and form a group. Which of the following does not belong to the group?

O has started on April 17. M has started the business on even numbered date after O. Only one person is starting the business between M and N. From the above condition, there are three possibilities. P has started two persons before D. D has started on an odd numbered date. C does not start on an even numbered date. A is starting the business on either November or April. The number of persons starting between B and C is same as between N and D. From the above condition, case1 and case3 get eliminated. Case2 shows the final arrangement.