Please assist

Suppose we are making predictions of the dependent variableyfor specific values of the independent variablexusing a simple linear regression model holding the confidence level constant. Let Width (C.I) = the width of the confidence interval for the average valueyfor a given value ofx, and Width (P.I) = the width of the prediction interval for a single valueyfor a given value ofx.

What would be a true statement of Width (C.I)?