What is diction? a) an author's word choice b) words that are inverted c) connotation in dialect d) formal language in poetry

I'm pretty sure it's A since the definition is the choice and use of words and phrases in speech or writing

I think it is an author's word choice. If you look up the definition of the word diction this is what you will find. 

Diction = the choice and use of words and phrases in speech or writing

Hope this helps!
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Ibelieve the correct answer is  d. they bound logs together and built a raft. enkidu steered it down the great river. gilgamesh carried humbaba's head.we know that gilgamesh was triumphant in this battle because he is carrying his enemy's head. he defeated humbaba, and then decapitated him to have his head as a trophy, or to show it to everyone that he managed to defeat his enemy.