I think the anwser is letter b
Answer:
Average Life Expectancy
Explanation:
According to my research and based on the information given within the question, I can say that these categories made a huge difference in the Average Life Expectancy in the United States in the last 100 years. This is because these are all categories that help you maintain your body healthy thus adding years to a persons life. About 100 years ago the life expectancy was an average of 40 years and now in 2019 it is an average of 75 years in the US.
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Answer:
Body play, in which an infant explores the ways in which his or her body works and interacts with the world, such as making funny sounds or discovering what happens in a fall. Object play, such as playing with toys, banging pots and pans, handling physical things in ways that use curiosity. Object play refers to playful use of objects such as building blocks, jigsaw puzzles, cars, dolls, etc. With babies, this play is mouthing objects and dropping them. With toddlers, this is sometimes just manipulating the objects. Social Play is any play in which children of the same age interact with each other. The play is structured (meaning there are rules to follow) and it may incorporate elements of pretend or imagination. For example, two children playing house or a group of children playing a game of tag are both examples of social play.
Explanation:
