Step 1: Meaning of the word:
'Tata' means stretched. Tata vadya are the instruments with stretched strings.
Step 2: Find the instrument with strings:
Of the four, only the violin has strings. Flute has no strings, ghatam is a pot and morsing is a metal reed instrument.
Step 3: Match with the other groups:
Flute is sushira (blown), ghatam and morsing are ghana (solid, struck or plucked on metal).
Step 4: Choose:
The violin fits the tata group. So option 3.
Step Extra: Extra check and memory aid.
Memory aid: link each word with a thing you can picture. Tata is the string (violin, veena, tambura). Sushira is the hole or blowing (flute, nadaswaram). Avanaddha is the covered skin (mridangam). Ghana is solid (ghatam, morsing, jalatarangam). The violin in the list is the only string picture, so option 3 is right.
Final Answer:
Stringed instruments are tata vadya, and the violin is the only stringed instrument listed. That is option 3.
\[ \boxed{\text{Option 3}} \]