Among the below mentioned formulae, which can be made agreeable by eliminating some or all of one essence?

(a) one part L, one part M, one part N, four parts P

(b) one part L, two parts N, one part O, four parts P

(c) one part L, one part M, one part O, one part P

(d) two parts M, one part N, two parts O, three parts P