Step 1: Lexical vs non-lexical categories.
The child uses function words correctly (e.g., {in, the, for, us, these}), showing awareness of lexical and non-lexical categories. This supports option (A).
Step 2: Word order acquisition.
Utterances such as “Put him in the bathtub” and “Thank you for giving us these books” show correct head–complement and spec–head orders of English syntax. Hence, option (B) is correct.
Step 3: Case marking.
Correct use of pronouns like {him}, {us}, and {my} indicates that the child has acquired case distinctions in English. This confirms option (C).
Step 4: Past tense formation.
Forms like {eated}, {runned}, and {rided} show overgeneralisation of the past tense rule rather than lack of acquisition. Hence, option (D) is not correct.
Step 5: Conclusion.
The correct answers are (A), (B), and (C).