Who among the following organized party immediately after B? 

Study the following information carefully to answer the given question: M, N, O, P, A, B, Y and Z have a party in either June or August of the same year which will be organized only on the four days viz. 8th, 11th, 18th and 23th of each month. No two people have a party on the same day. M has a party in June on an even numbered date. Only four people have a party between M and O. There are three people have party between O and N. Only two people have a party between A and N. Both Z and Y have to arrange a party on the same date. Z has to party on one of the days after Y. No one has to arrange a party between Z and
B. P has to arrange a party on 18th June.