Make or play what? what exactly are you asking
Answer:
What are the most effective dog-training techniques? - a blog from an expert dog trainer
Why are dogs especially intelligent animals? - the encyclopedia entry "Canine"
How do scientists measure the intelligence of dogs? - an article from the Journal of Animal Biology
Explanation:
1. Dog-training : dog trainer!
2. Encyclopedias often give reasons on <em>why</em> and what more than anything.
3. Science journals give their methods and reasoning on their projects a lot.
The correct answer is B, 'predicate adjective', because 'happy' follows a linking verb (was) and is an adjective, so this has to be the correct answer.
'Predicate nominative' has to be a noun. 'Indirect object' is a noun or a pronoun. And the 'objective complement' is again, a noun (He was elected king, where KING is the objective complement).