What was established alongside the public school for the deaf in France during the 1760s?

The correct answer highlights a significant development during the 1760s in France, specifically regarding the educational practices for the deaf. During this period, the establishment of the public school for the deaf, known as the "Institution Nationale des Sourds-Muets," marked a pivotal moment, and it was indeed during this time that fingerspelling as a communication method gained formal recognition and structure.

Fingerspelling became an essential tool for teaching the deaf, facilitating communication, and connecting sign language with the written language. This development was crucial as it provided a systematic way for deaf students to learn language, bridging the gap between spoken and signed communication. The establishment of such practices laid the groundwork for further advancements in deaf education and communication.

In contrast, while training programs for teachers and advocacy groups have been integral in advancing deaf education and rights, these formal structures were more developed much later. The focus on fingerspelling as an educational method directly corresponds to the innovative methods being introduced alongside the establishment of the educational institutions for the deaf at that time.