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

Microsoft References

Azure AI Language – Key phrase extraction

TextAnalyticsClient.ExtractKeyPhrases method (Azure.AI.TextAnalytics)