To avoid damaging important structures in the lower limbs of infants, intramuscular injections are administered into the

Intramuscular injections are administered into the VASTUS LATERALIS. Vastus lateralis muscle is located on the side of the thigh; the muscle is the largest of the group of muscles called quadriceps. Administering injection on this site in infants drastically lowers the risks of damaging important structures in infants. 

The part of a scientific argument must be supported by valid data is evidence. this will make the correct answer choice b.