Step 1: Think by geography.
Kashmiri is spoken in the high north west. The language group of that area is Dardic, found in Kashmir, Gilgit and nearby mountain valleys.
Step 2: Remove clearly wrong families.
Dravidian is a southern family and Austro-Asiatic is a central and eastern family. Neither one is spoken in Kashmir, so both are removed.
Step 3: Choose between Indo-Aryan and Dardic.
Indo-Aryan is the big parent branch that holds Hindi and Bengali. Dardic is the smaller group nearer to Kashmiri, with shared sound changes and grammar. It is often treated as a sub group of Indo-Aryan.
Step 4: Select the narrower and more exact answer.
Since the question asks for the group that Kashmiri belongs to, the exact group Dardic is the better match. That is option 4.
Step 5: Second check.
It helps to remember a short list of Dardic languages: Kashmiri, Shina, Kohistani and Khowar. These are all spoken in or near the high mountains of the north west. Hindi and Punjabi sit in the wider Indo-Aryan group but are not called Dardic. If an exam gives both Indo-Aryan and Dardic, the narrower label is normally the one expected, so option 4 is kept as the answer.
Final Answer:
Kashmiri is a Dardic language, so option 4 is correct.
\[\boxed{\text{Option 4}}\]