Explanation:

Let’s break it down step by step:

- There are eight candidates, and their exams fall on either the 5th or the 20th of March, May, June, and July.

- C has an exam on 20th May, and A’s exam is immediately after C’s—you’d place A on 5th June.

- Two people have exams between A and B, so B can’t be immediately after or before A.

- D’s exam is in a month with 30 days (June has 30 days).

- E’s exam follows D’s, so E can’t be the last exam in the set.

- F’s comes right after G’s but not in the same month—so, if G is on the 20th of a month, F is on the 5th of the next.

- Now, focusing on the key question: “How many people have exams after C?”

Since C is on 20th May, and every month after May (June 5th, June 20th, July 5th, July 20th) and also the next slot in May (if not used), but since immediately after C is A (which goes to June), the possible sequence after C is:

1. A (5th June)

2. D/E (June 20th or July, depending on how you assign)

3. E/D (right after D)

4. G

5. F

6. H

But ultimately, there are four people who have their exams after C, not five.

- Option 1: Three — Incorrect.

- Option 2: Four — Correct answer.

- Option 3: One — Nope.

- Option 4: Five — Not matching the logic.

- Option 5: Two — Too few.

Correct answer: Option 2 — Four people have exams after C.