Concept:
A good conversationalist is not only a person who speaks well.
A good conversationalist also understands the other person's feelings, mood, and situation.
Such a person speaks in a way that suits the listener.
Step 1: Understand the meaning of conversationalist.
A conversationalist is a person who takes part in conversation.
A good conversationalist:
\[
\text{listens carefully}
\]
\[
\text{understands the listener's emotions}
\]
\[
\text{responds appropriately}
\]
\[
\text{keeps the conversation meaningful and comfortable}
\]
Step 2: Check the options.
Option (A) sympathetic communicator is close, but it is not as complete.
Option (B) efficient communicator is too general.
Option (C) says a person who reads others' emotions and talks accordingly. This is the most accurate meaning.
Option (D) says someone who can talk pleasantly to improve the situation, but this is only one part of being a good conversationalist.
Step 3: Choose the best answer.
The best meaning is:
\[
\text{who reads others emotion and talk accordingly}
\]
Hence, the correct answer is:
\[
\boxed{(C)}
\]