Correct Answer: d, b, c, e, a

Solution : Given:
a. Intricate b. Interview c. Intransigent d. Interrogation e. Intravenous

Step 1: Compare the first, second, and third letters of each word. Since all the words start with the same letters I, n, and t, then move on to the next letter.
Step 2: The fourth letter of each word is either e or r . Based on the alphabetical order of these letters, we can arrange them – Int e rview, Int e rrogation, Int r icate, Int r ansigent, Int r avenous.
Step 3: Compare the sixth letter of (Inter v iew, Inter r ogation). Interrogation will come before Interview in the sequence as r comes before v in the alphabetical system.
Step 4: Compare the fifth letter of (Intr i cate, Intr a nsigent, Intr a venous). Intransigent and Intravenous will come before Intricate as a comes before i .
Step 5: Compare the sixth letter of (Intra n sigent, Intra v enous). Intransigent will come before Intravenous in the sequence as n comes before v in the alphabetical system.

So, the sequence is Interrogation, Interview, Intransigent, Intravenous, Intricate, or d, b, c, e, a. Hence, the third option is correct.