You are measuring the heart beats in time.
To check your pulse at your wrist, place two fingers between the bone and the tendon over your radial artery — which is located on the thumb side of your wrist. When you feel your pulse, count the number of beats in 15 seconds. Multiply this number by four to calculate your beats per minute.
Normal rate depends upon your age group:-
Children 5 to 6 years old 75 to 115 bpm
Children 7 to 9 years old 70 to 110 bpm
Children 10 years and older and adults (including seniors) 60 to 100 bpm.
Therefore, third option is the correct answer.
To learn more about heart beats, refer here :
https://brainly.com/question/17987146
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