Women who are underweight at the beginning of a pregnancy have an increased risk of

""If you're underweight at the start of your pregnancy, you have a greater risk of having a preterm birth or a small for gestational age (SGA) baby."

https://www.babycenter.com/0_pregnant-and-underweight-how-to-get-the-nutrients-you-need_1313894.bc

If it's a smaller child or infant, place one on the middle of the chest and on the child's back. (if it is a bigger child with enough room for two, place one on the upper right/your left of the chest, and one on the lower left/your right) the pads should never touch each other. 

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