After exchanging the 3rd and 6th letters and the 4th and 9th letters, as well as the 5th and 10th letters in the given words, which series would result in a meaningful word after this rearrangement?

I. HRETIAGVSN

II. FLNESAGOMI

III. EXSONHTIAU

Given :

According to the question after exchanging the 3rd and 6th letters and the 4th and 9th letters, as well as the 5th and 10th letters in the given words :

I. HRETIAGVSN

3rd and 6th letters → E and A to be interchanged

4th and 9th letters → T and S to be interchanged

5th and 10th letters → I and N to be interchanged

After interchanging  → HRASNEGVTI ⇒ No meaningful word formed

II. FLNESAGOMI

3rd and 6th letters → N and A to be interchanged

4th and 9th letters → E and M to be interchanged

5th and 10th letters → S and I to be interchanged

After interchanging  → FLAMINGOES ⇒  Meaningful word formed

III. EXSONHTIAU

3rd and 6th letters → S and H to be interchanged

4th and 9th letters → O and A to be interchanged

5th and 10th letters → N and U to be interchanged

After interchanging  → EXHAUSTION ⇒ Meaningful word formed

Thus from the given series, II and III form a meaningful word after interchanging. 

Hence, "Option - (1)" is the correct answer.

Confusion Points

The plural of "flamingo" is "flamingos" or "flamingoes."

Ex.:- 1. Well-fed, healthy flamingos are more vibrantly coloured.

2. Flamingoes aggressively defend their nesting sites.