A "Distribution of Differences Between Means" Can Be Thought of as a Distribution

A "distribution of differences between means" can be thought of as a distribution of

A) difference scores,which are found by subtracting sample means from the population mean.
B) the differences obtained when several methods of estimating the population mean are used in sequence.
C) the differences obtained when a sample mean from one population is repeatedly subtracted from a sample mean from another population.
D) the differences between a single sample from Population 1 and all possible samples from Population 2.