Correct Answer: iv, v, ii, i, iii

Solution : Given:
i. Irrelevant ii. Invincible iii. Irresistible iv. Invariable v. Investigate

Step 1: Compare the first letter of each word. Since all the words start with the same letter I , we move on to the next letter.
Step 2: Let's move to the second letter of each word. The second letter of each word is r, n, r, n, n . Based on the alphabetical order of these letters, we can arrange them: I n vincible, I n variable, I n vestigate I r relevant, I r resistible.
Step 3: Since the third letter of (In v incible, In v ariable, In v estigate) is the same, move on to the next letter. Compare the fourth letter of  (Inv i ncible, Inv a riable, Inv e stigate). Inv a riable will come before Inv e stigate and then Inv i ncible in the sequence as a comes before e , and e comes before i in the alphabetical system.
Step 4: Compare the fifth letter of (Irre l evant, Irre s istible). Irre l evant will come before Irre s istible in the sequence as i comes before s in the alphabetical system.

So, the sequence is Invariable, Investigate, Invincible, Irrelevant, Irresistible, or (iv), (v), (ii), (i), (iii). Hence, the fourth option is correct.