Actually, for the question about the number of twins born each year, a bar graph would be more appropriate. A bar graph is used to display and compare categorical data, where each category is represented by a bar. In this case, the number of twins born each year would be a categorical variable (e.g., year), and the height of each bar would represent the frequency or count of twins born in that year. This type of graph would allow you to track the changes in the number of twins born over time.
Regarding the survey of what teens do for entertainment after school, a bar graph or a stacked bar graph would be more suitable than a line plot. A bar graph is used to display categorical data, where each category is represented by a bar. In this case, each category would represent a type of entertainment (e.g., sports, video games, reading) and the height of each bar would represent the frequency or percentage of teens engaging in that particular activity. This type of graph would allow you to compare the popularity of different entertainment activities among teens. A stacked bar graph could be used if you want to compare the distribution of activities within each category (e.g., different types of sports within the sports category).
A line plot, on the other hand, is typically used to display numerical data with a continuous range. It shows individual data points along a number line, and the points are connected by line segments. It might not be the most suitable choice for displaying categorical data like the survey responses you mentioned.