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.
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Answer:
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Answer:
Yes, and they will add that they express the social situation in which society finds itself or seek to escape from traditional methods of expression.
Some artists maintain that the innermost part of the unconscious of the author of the artistic work is expressed, that is why they transmit so many feelings, a work without transmission is a work that is not considered art.
In addition, art at different times in its history always greatly influences architecture and social realities.
Explanation:
Society manifests its social realities in an artistic way by means of works of art, graffiti, sculptures, artistic interventions on public roads, art exhibitions, by means of instruments, by means of innovative methods.
But a society without artistic expression lacks cultures and artistic cognitive development as human.