An online news aggregator provides suggestions of related news articles to the user based on content features of a news article he or she is currently reading. Based on Tom Mitchell’s PET framework, identify the Task (T).
选项：

A: Mark a news article as relevant or not relevant.
B: Classify the topic of a news article based on content features.
C: Classify a news article as relevant or not relevant.
D: Group news articles into different sets based on content features.