In a longitudinal study by Silvey et al. (2021), parents’ language addressed to children was associated with higher scores in vocabulary if __________________ and higher scores in grammatical knowledge if ___________________.
it contained a greater variety of words; it increased in grammatical complexity with the child’s age
it increased in grammatical complexity with the child’s age; it contained a greater variety of words
it contained a greater variety of words; parents spoke in very complex grammar to the child at an early age
it contained more total words, regardless of how varied they were; it increased in grammatical complexity with the child’s age