Encapsulation is referring to the concept that data buding with some approach or method that is applied to that selected data. it also restricts the use of some internal data of an object. The motive behind restricting the data is to prevent the misuse of the data.
For example- in java, encapsulation is refer to the wrapping of code with the data in one unit.
C. because they grade your get 'depends' on how many hours you study. Independent variables are also known as controlled variables which basically means that you control that variable for example the temperature of a room.