Explanation:

- The Bobbili Veena or Saraswathi Veena is a prominent instrument in Carnatic music.

- Option 2: Jackfruit wood is traditionally used to craft this instrument.

- Jackfruit wood provides the resonant quality needed for the veena's sound.

- Option 1: Walnut wood is not typically used for traditional Indian string instruments.

- Option 3: Teak wood is durable but not preferred for veena construction.

- Option 4: Sandalwood is aromatic but not commonly used for making veenas.

- Each wood type contributes differently to the tonal quality and aesthetics of instruments.