The temperature in a city was recorded over a ten-hour period. the graph below shows the relationship between the temperature and the number of hours.

which statement best interprets information provided by the graph?
a. the temperature in the city increased for some time and decreased for some time.
b. the temperature remained constant for a while.
c. the temperature in the city increased throughout the period.
d. the temperature in the city increased at a constant rate for the entire time.