Maybe something like crystal I think, but out of yours I would pick karma!
        
                    
             
        
        
        
Altering the harmony underneath the theme are the examples of thematic development. So,the correct answer is option b.
What is Thematic development?
A leitmotif, or theme, is formed by the musical technique known as "thematic transformation," which involves modifying the theme through permutation, augmentation, diminution, and fragmentation. 
Franz Liszt and Hector Berlioz were principally responsible for its creation. In essence, the technique is one of variation. In essence, the technique is one of variation. A core theme is repeated repeatedly throughout a musical work, although it constantly changes appearances and takes on several opposing functions. 
The architectural function of the sonata form in the classical symphony was to achieve "unity among variety," and this theme will always serve that purpose. Thematic transformation can support the emotionally charged phrases, richly coloured melodies, and atmospheric harmonies used by Romantic composers, which makes a difference in this instance.
To know more about Thematic development visit:
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<span>For his Ninth and final symphony, Beethoven wove the themes of the Enlightenment into his work. He finally saw a chance to use Friedrich Schiller's "Ode to Joy" — Beethoven had long wanted to set the poem to music for its themes of freedom and brotherhood. The Ninth, dedicated to Friedrich Wilhelm III of Prussia, influenced composers that followed, including Schubert, Brahms and Mahler. 
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