The answer to your question is c.invented because it's a past participle.
What are the options?
Is there any under the question?
Answer:
<u>We named the dog Timmy.</u>
Explanation:
An objective complement an adjective or noun that follows a direct object and describes it. The objective complement in the sentence above is <em>Timmy</em> (describes the direct object, <em>dog</em>).