The general range of speed in revolutions per minute (rpm) at which floppy disks rotate is?
A. 2400-4700
B. 390-600
C. 150-250
D. 300-600
E. None of the above

Hint: As a very first step, you could make a brief description of the Floppy disk and also about its usage and other related aspects. Then, you could explain what a RPM is and also explain as to which parameter is measured in RPM. Then, you could simply give the general range of RPM of floppy disk’s rotation.

Complete answer:
In the question, we are asked to find the general range of speed of rotation of a floppy disk in revolutions per minute (rpm). Let us recall what a floppy disk actually is,
Floppy disk basically is a device that is basically used for disk storage and it comprises a thin and flexible disk of a magnetic storage medium in a nearly square enclosure. The floppy disks were the primary external writable storage device that was used for over two decades.
Now, the general range of speed in revolutions per minute of rotation of a floppy disk is 150-250.
Revolutions per minute are the number of turns taken in every one minute. So, we could say that in every one minute a floppy disk undergoes 150-250 rotations.

Hence, option C is right.

Note:
The floppy disks were major means of transport of data between computers during the non-networked times. This method is called sneakernet. Softwares use floppy disk symbols on user interface elements that are related to saving files, For example, Microsoft office. After being the primary external writable storage device for a long time, now physical floppy disks are obsolete.