The correct answer to this question is B. A sitar is an instrument that has a long, broad, fretted neck and a gourd-shaped body. It can have 18, 19, 20, or 21 strings. Up to 6 or 7 of the strings run over curved or rasied frets. The remainder of the strings are what are caled sympathetic strings that run underneath the frets.
Chords are not played on a sitar, but rather melodies on two of the strings, while the other strings are tuned to the chord of "raga." When a sitarist tries to adjust the tension and pluck the strings suitably, they are adjusting the frequency of the sitar string with the frequency of the other musical instruments in the orchestra.