The correct answer is C. Intercept.
The intercept is the value of the dependent variable when all the independent variables are zero. It is the point where the line of best fit crosses the y-axis.
The slope is the change in the dependent variable for every unit change in the independent variable. It is the ratio of the change in the dependent variable to the change in the independent variable.
The sum of residual is the sum of the squared differences between the actual values of the dependent variable and the predicted values of the dependent variable. It is a measure of the error in the model.
It is difficult to tell the answer without knowing the context of the question. However, if the question is about linear regression, then the answer is C. Intercept.