The correct answer is C. 2.
A primary partition is a partition on a hard disk drive that can be used to boot an operating system. On a traditional MBR (Master Boot Record) disk, there can be up to four primary partitions. If you need more than four partitions, you can create an extended partition, which can then contain logical partitions.
Option A is incorrect because it is not possible to have 16 primary partitions on a single drive.
Option B is incorrect because it is possible to have more than four primary partitions on a single drive, if you use extended partitions.
Option D is incorrect because it is possible to have more than one primary partition on a single drive.
Option E is incorrect because it is possible to have primary partitions on a single drive.