At a school, 40 students reported their participation in chess club and art club. The results are shown in the table.
| Club participation | Number of students |
|---|---|
| Chess club only | 12 |
| Art club only | 8 |
| Both chess club and art club | 5 |
| Neither club | 15 |
One student is selected at random from the students who participate in at least one of the two clubs. Which choice gives the probability that the selected student participates in chess club?