Final answer:
The statement that the language acquisition device (LAD) explains how environment shapes language development is FALSE because LAD relates to the innate biological capacity for language acquisition, not the environmental influences.
Step-by-step explanation:
Regarding the concept of the language acquisition device (LAD), the statement that is FALSE is:
d. It explains how environment shapes language development.
The language acquisition device represents an innate mechanism in the brain for learning language, and it is believed to be prewired into the human nervous system, but critics often view it as an abstract concept rather than a physical structure in the brain. The LAD is linked to the innate biological capability for language acquisition, not the environmental shaping of language development. Environmental factors do play a role in language development, but the LAD concept specifically refers to the inborn capacity to learn language, which is believed to be a universal feature of human biology.