What is the name of the constructed international auxiliary language created by Charles Bliss in the 1940s, based on ideographic symbols, which found its primary application in augmentative communication for people with cerebral palsy?

• A Esperanto
• B Interlingua
• C Ido
• D Blissymbols ✓

Blissymbolics, while not widely adopted as an international language, became an important tool for non-speaking individuals starting in Canada in the 1970s.