The option that uses referents to make it most coherent is "Lihn is punctual, attentive, and helpful".
In a text, coherence implies all the ideas are connected logically and the ideas are related to each other and the general topic.
For this text to be coherent, the author will need to explain why Lihn is "one of the most valued singers". Due to this, it is expected the author describes Lihn's qualities.
The only option that focuses on these qualities is "Lihn is punctual, attentive, and helpful", and therefore this option would provide coherence.
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