I think its A, but its a maybe
your answer is headstrong
The best choice to fill in the blank is (C) a headstrong person, as it reflects a strong-willed character that would insist on not being interrupted. Other options lack the contextual support needed for insisting at a conference. Therefore, 'headstrong' is the most fitting description in this context.
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Jawaban:1. J. Pewarna basah2. D. Krayon3. G. Kanvas4. A. Bangga5. C. Hargai6. B. Non-geometris7. -8. E. Geometris9. F. Sketsa10. H. Pelukis