Which of the following are signs of electrical shock?

The correct answer identifies signs of electrical shock that are more directly related to the physiological effects of electric current passing through the body. Tingling sensations, muscle spasms, burns, and loss of consciousness are all symptoms that can result from electrical shock due to the way electricity affects the nervous system and can disrupt normal bodily functions.

When a person experiences an electrical shock, the current can cause involuntary muscle contractions, leading to spasms. Tingling sensations may arise from nerve stimulation or damage, and burns can occur at entry and exit points of the electrical path through the body. Loss of consciousness can be a severe response if the current affects the brain's electrical activity or disrupts normal heart rhythm.

The other options, while potentially related to various health issues, do not specifically convey the immediate effects of electrical shock as accurately as the correct choice does. For example, headaches and tiredness, difficulty breathing, nausea, and dizziness could be symptoms of other medical conditions but are not distinct indicators that someone is experiencing electrical shock.