Because she practiced her presentation so diligently, Jamie was not the least bit nervous when she stepped onto the stage. (Points : 1)

Because she had practiced her presentation so diligently, Jamie
Because she had practiced her presentation, so diligent, Jamie
Because she had practiced her presentation so diligently Jamie
Because she had practiced her presentation so diligent, Jamie

I'll be glad to check your answer.

Because she had practiced her presentation so diligently, Jamie

The correct answer is: Because she had practiced her presentation so diligently, Jamie.

To determine the correct answer, we need to analyze the sentence structure and grammar.

In the sentence, we have the subject "Jamie," the verb "was," and the adverbial phrase "Because she had practiced her presentation so diligently" which explains the reason for Jamie not being nervous.

The correct answer follows the correct sentence structure where the adverbial phrase is separated from the main clause using a comma. Additionally, the adverbial phrase is in the correct form, using the adverb "diligently" to modify the verb "practiced."

Let's analyze the options one by one:

1) Because she had practiced her presentation so diligently, Jamie - This is the correct answer as it follows the correct sentence structure and uses the correct form of the adverb "diligently."

2) Because she had practiced her presentation, so diligent, Jamie - This option is incorrect as it breaks the sentence structure by placing a comma after the main verb "practiced" instead of after the adverbial phrase. Additionally, it uses the adjective "diligent" instead of the adverb "diligently" to modify the verb.

3) Because she had practiced her presentation so diligently Jamie - This option is incorrect as it does not separate the adverbial phrase from the main clause using a comma.

4) Because she had practiced her presentation so diligent, Jamie - This option is incorrect as it uses the adjective "diligent" instead of the adverb "diligently" to modify the verb.

Therefore, the correct option is: Because she had practiced her presentation so diligently, Jamie.