Step 1: Recall the main categories of communication barriers.
Communication hurdles are grouped into Language (semantic), Physical (environmental), Emotional (psychological), and Organisational (systematic) barriers.
Step 2: Understand "related to mental state".
A mental state refers to what is happening inside a person's mind - their emotions, mood, feelings, fears, or biases at a given moment.
Step 3: Evaluate Language Hurdle.
Language barriers occur when words are misunderstood due to different vocabulary, dialect, or translation errors. This is a semantic issue, not a mental-state issue.
Step 4: Evaluate Physical Hurdle.
Physical barriers are external environmental obstacles - noise, distance, poor lighting, or technical faults. These are outside the person's mind.
Step 5: Evaluate Systematic (Organisational) Hurdle.
These arise from the structure of the organisation - too many levels of hierarchy, rigid procedures, or status differences. Again, these are structural, not mental.
Step 6: Confirm Emotional Hurdle.
Emotions such as anger, fear, anxiety, stress, or prejudice are internal mental states. They distort how a message is sent or received, making Emotional Hurdle the correct answer for a barrier related to mental state.
\[ \boxed{ \text{(C) Emotional Hurdle} } \]