At what age do children begin to regulate their emotions with awareness of what would be a better response or the right thing to do?

The age of 4 the children become aware and emotionally responsible and reliable

Bmust be the answer, as technically all organs move, so a is incorrect. all organs are made of different types of cells, so that isn’t a problem, so c is also incorrect. human hearts are very similar to many other animals’ hearts, so d is also incorrect, yet the heart is made of muscle, which is hard to grow in the lab so it would be correct to say b