Newton’s cooling law is applicable only when [A] the difference in temperature is not very much. This law describes the rate of cooling of an object in relation to the temperature difference between the object and its surroundings. It assumes that the temperature difference is small enough to maintain a linear relationship between the rate of cooling and the temperature difference. However, if the temperature difference is very large, nonlinear effects such as convection currents and radiation become more significant, and Newton’s law of cooling may not accurately describe the cooling process. Therefore, it is most applicable when the temperature difference is relatively small, allowing for a linear approximation of the cooling rate. Options [B], [C], and [D] are incorrect as they do not accurately describe the conditions under which Newton’s cooling law applies.