William would be considered as Functionally illiterate.
What is Functionally illiterate
Functionally illiterate refers to individuals who have difficulty reading, writing, and comprehending written information in their daily lives. It means that they have limited literacy skills that hinder their ability to effectively function and participate in various activities that require reading and understanding written materials. Functionally illiterate individuals may struggle with tasks such as reading signs, filling out forms, understanding instructions, or comprehending written information on product labels, like in the case of William. In which he is looking at the picture on the labels of the goods on the shelves.