Choose the option that best corrects the underlined words:
When it is played by the method of strumming, the music produced by the guitar is louder than many other instruments.
Here we're comparing the phrases 'the music produced by the guitar' and 'the music produced by many other instruments'. We're comparing the music of two instruments and not the instruments themselves. Hence the correct option is B and A is the incorrect option. Similarly Option C is incorrect because we're not comparing 'music' with 'many other musical instruments' but with 'the music produced' by those instruments. 'Those of other instruments' is incorrect because 'those' is a demonstrative for plural nouns and 'music' is singular.