During the childhood, physical development is in infancy.

the same rate
more rapid
less rapid

During the childhood, the physical development is more rapid in infancy. 
From birth to eight years old, it is a time of tremendous growth. Between birth and age three a child ordinarily doubles in height and quadruples in weight. Body proportions shift, in order for the infant whose head is almost one-fourth of its body weight altogether now is a toddler with a more balanced, adult-like appearance. Around this age a typical three year old will have mastered walking, sitting, scribbling, toilet-training, using a utensil, and sufficient eye-coordination despite rapid growth. 
Between ages five and three children will have developed fine-motor skills. 
Physical growth typically slows down between five and eight years old, whilst body proportions and motor skills are becoming more sufficient. 
Children also develop a spoken vocabulary that ranges between 300 and 1,000 words within the first three years of life. 

I hope this answered your question, good luck on your assignment. Education.stateuniversity.com is a handy tool for questions like this as well. 

Aand b would both be correct

Answerpoor public health services;