Correct Answer: Aquatic

Solution : Given:
1. Aquarium 2. Aquatic 3. Aquarial 4. Aquatint 5. Aquavit

Step 1: The first four letters of each word are the same – a , q , u , a ; so move on to the next letter.
Step 2: The fifth letter of each word is – r, t, r, t, v. Based on the alphabetical order of these letters, we can arrange them – Aqua r ium, Aqua r ial, Aqua t ic, Aqua t int, Aqua v it.
Step 3: Compare the seventh letter of (Aquari u m, Aquari a l) and (Aquati c , Aquati n t). Aquarial will come before Aquarium in the sequence as a comes before u in the alphabetical system. Similarly, Aquatic will come before Aquatint in the system as c comes before n in the alphabetical system.
So, the sequence is Aquarial, Aquarium, Aquatic, Aquatint, Aquavit.

Therefore, Aquatic is in the third position according to the dictionary order. Hence, the first option is correct.