The correct option is C Infant mortality rate
We can study and measure the state of reproductive health using certain metrics like maternal mortality, infant mortality, and child mortality rates. Maternal mortality rate refers to the number of maternal deaths for every one lakh live births. Infant mortality rate refers to the number of deaths of infants or children below the age of one per one thousand live births. Child mortality rate refers to the number of deaths of children under the age of five per one thousand live births.