Final answer:
Option D 'The teacher appeared angry when Dave forgot his homework.' is the sentence that contains a predicate adjective. Here, 'angry' is the predicate adjective modifying the subject 'teacher.'
Step-by-step explanation:
A predicate adjective is an adjective that is within the predicate and which modifies the subject of the sentence. It is typically linked to the subject by a linking verb such as 'is', 'appear', 'feel', 'become', and others. In the case of the examples provided, we're looking for a sentence structure similar to (subject) + (linking verb) + (predicate adjective).
Examining the sentence -
D. The teacher appeared angry when Dave forgot his homework.
Sentence D contains the structure where 'the teacher' is the subject, 'appeared' acts as the linking verb, and 'angry' is the predicate adjective that describes the subject. Therefore, option D is the one that contains a predicate adjective with 'angry' modifying 'the teacher'.