The probabilities that a student passes in Mathematics, Physics and Chemistry are m, p and c, respectively. On these subjects, the student has a 75% chance of passing in at least one, a 50% chance of passing in at least two and a 40% chance of passing in exactly two. Which of the following relations are true?
(A) p + m + c = 19/20
(B) p + m + c = 27/20
(C) pmc = 1/10
(D) pmc = 1/4