Explanation:

Let's break down and explain the statements and options:

- A delivers on 6th of a 31-day month (Jan, Mar, July), but not in March.

- E gives a lecture immediately after B.

- 3 lectures are between A and B.

- Exactly 2 lectures between F and C; C is not last.

- Same number of people deliver after E as before F.

- G and C are in the same month.

- D is before H.

Let’s Step-by-step deduce:

- The dates: 6 or 17. The months: Jan, Mar, Apr, July. 8 lectures, so each date/month is used once.

- Since A can be Jan 6 or July 6 (since March is not allowed), and there need to be 3 people between A and B, so their positions are far apart.

- B and E are consecutive (B then E).

- The person who delivers on 17th April: After filling all positions with rules,

- C and G must be in the same month: Only April is left for both, so either C or G on 6th and the other on 17th.

- D must come before H.

- C is not last.

After full arrangement:

- April 6: C

- April 17: G

- The only option where G is 17 April.

Options:

1. A

2. B

3. C

4. D

5. G

So, the correct answer is Option 5: G

(Because you selected Option 4 - D, but the correct answer is Option 5 - G.)