The electric guitar is the key instrument that led to the development of the electric blues genre. Its amplification allowed musicians to express themselves more dynamically than with acoustic instruments. While other instruments support the genre, the electric guitar remains central to its identity. ;
The electric guitar is the key instrument that led to the development of the electric blues genre, emerging prominently in the 1940s. It transformed the sound of blues by allowing musicians to amplify their music and express themselves more dynamically. Therefore, the correct answer is C. electric guitar.
;