Step 1: Understand the concept:
Stress shows itself in the body, in the mind and in a person's actions. Textbooks sort the signs into three groups: physiological, psychological and behavioural.
Step 2: Read the symptoms given:
Tension, anxiety, irritability and boredom are all feelings and moods. They belong to the mind and the emotions of a person.
Feelings and thoughts are called psychological signs.
Step 3: Check option (A) Behavioural.
Behavioural symptoms are visible actions, such as eating too little or too much, sleeping badly or taking more tea and cigarettes. The words in the question are feelings, not actions. So (A) is wrong.
Step 4: Check option (B) Physiological.
Physiological symptoms are changes in the body, such as headache, fast heartbeat, high blood pressure and tiredness. None of the given words is a body change. So (B) is wrong.
Step 5: Check option (D) Detectable.
This is not a type of stress symptom in the textbook. It only means something that can be noticed. So (D) is wrong.
Final Answer:
Tension, anxiety, irritability and boredom are psychological symptoms of stress, which is option (C).