The correct answer is C. Sequential.
A cassette tape is a magnetic tape data storage medium for audio and data recording. It was invented in Germany by Dr. Fritz Pfleumer in 1928 and first marketed by BASF in 1935. Cassette tapes were widely used for music recording and playback in the 1970s, 1980s, and 1990s, and are still used today for some applications.
The access method used for cassette tape is sequential. This means that data is stored on the tape in a linear fashion, and the tape must be played back from beginning to end in order to access any particular piece of data. This is in contrast to direct access storage devices, such as hard disks, which can access any piece of data on the disk without having to read all of the data that comes before it.
The main advantage of sequential access is that it is simpler and cheaper to implement than direct access. The main disadvantage is that it is slower, as the tape must be played back from beginning to end in order to access any particular piece of data.
In conclusion, the access method used for cassette tape is sequential. This means that data is stored on the tape in a linear fashion, and the tape must be played back from beginning to end in order to access any particular piece of data.