To solve this question, the user needs to know about mainframe utilities and their functions.

Option A: IEFBR14 is a dummy utility that does nothing but return a completion code of 0. It is not used for copying partitioned datasets, so option A is incorrect.

Option B: IEBCOPY is the correct answer. It is a mainframe utility used to copy, merge, and compare partitioned datasets. It can also be used to create empty partitioned datasets and members. Therefore, option B is correct.

Option C: IEBGENER is used to copy, transform, and print datasets. It is not used to copy partitioned datasets, so option C is incorrect.

Option D: IEBCOMPR is used to compare two datasets and identify differences between them. It is not used to copy partitioned datasets, so option D is incorrect.

Option E: None of the above is not the correct answer because the correct answer is option B.

Therefore, the answer is: B. IEBCOPY.