The probabilities that a student passes in Mathematics,Physics and Chemistry are m, p and c, respectively. Of 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)`