Which method is the correct way to check your pulse rate manually on your wrist?

I'm going to say B. (Sorry if this is wrong please correct me if so.) Good luck

Explanation:

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.

      x/140 = 25/100

we need to find the x to find the x multiply 140 and 25

and what do you get 3500.   and what is 3500 divided by 100

= 35