The correct answer is option 3: 71-80. In an average adult human, the number of heartbeats falls within this range. The heartbeats per minute (BPM) can vary among individuals based on factors such as age, fitness level, and overall health. The normal resting heart rate for adults is typically between 60-100 BPM. However, a heart rate between 71-80 is considered within the healthy range and is common for most adults. It is important to note that extreme fluctuations in heart rate outside of this range may indicate an underlying health issue and should be evaluated by a medical professional. Therefore, option 3 is the correct answer for the average range of heartbeats in an adult human.