Final answer:
Elisabeth-Claude Jacquet de la Guerre's compositions are most closely associated with the harpsichord.
Step-by-step explanation:
Elisabeth-Claude Jacquet de la Guerre's compositions are most closely associated with the harpsichord. She was a French composer and harpsichordist who gained recognition for her keyboard compositions and performances during the Baroque period. Jacquet de la Guerre's works for the harpsichord showcase her skill and innovative musical style, making her one of the most significant composers for this instrument.