You have the following C# function.

The provided code uses the Azure AI Language – Text Analytics client to call the ExtractKeyPhrases method.

The method ExtractKeyPhrases(text) identifies the most important words and phrases in the input text.

The input string is:

"the quick brown fox jumps over the lazy dog"

The ExtractKeyPhrases API removes stopwords such as "the," "over," and "jumps" and extracts only meaningful keywords.

Therefore, the returned list of key phrases will include:

"Quick brown fox"

"Lazy dog"

When printed, the console output after "Key phrases:" will show:

Quick brown fox

Lazy dog

This matches option C (Quick brown fox lazy dog), since the key phrases are concatenated as output lines.

Correct Answer: C. Quick brown fox lazy dog

Azure AI Language – Key phrase extraction

TextAnalyticsClient.ExtractKeyPhrases method (Azure.AI.TextAnalytics)

Microsoft References