Step 1: Understanding the Concept:
The question asks to identify the string instruments from the given list. Musical instruments are classified based on how they produce sound. String instruments, or chordophones, produce sound through the vibration of strings.
Step 2: Detailed Explanation:
Let's classify each instrument:
- (A) Guitar: This is a popular instrument that produces sound by plucking its strings. It is a string instrument.
- (B) Mridangam: This is a classical South Indian double-headed drum. It is a percussion instrument (specifically, a membranophone, where sound is produced by a vibrating membrane).
- (C) Sitar: This is a well-known Indian classical instrument. It produces sound from plucked strings. It is a string instrument.
- (D) Cymbal: This consists of two brass plates that are struck together. It is a percussion instrument (specifically, an idiophone, where the body of the instrument itself vibrates to produce sound).
Step 3: Final Answer:
From the list, the Guitar and the Sitar are string instruments. Therefore, the correct option is (A) and (C) only.