The correct answer is B. sequential.
A cassette tape is a magnetic tape data storage medium that was widely used to record and playback sound from the 1960s to the 2000s. It is a sequential access device, which means that the data is stored in a linear fashion and can only be accessed in order. This is in contrast to a random access device, such as a hard drive, which can access data at any point on the disk.
The reason why cassette tapes are sequential access devices is because of the way they are physically constructed. The tape is wound around two spools, and the recording head is located at a fixed point on the tape. To access a particular piece of data, the tape must be wound forward or backward until the desired location is reached.
Sequential access can be a disadvantage in some cases, such as when you need to quickly access a specific piece of data. However, it is also an advantage in other cases, such as when you need to play back a recording in order from beginning to end.
In conclusion, the access method used for obtaining a record from a cassette tape is sequential. This means that the data is stored in a linear fashion and can only be accessed in order.