The correct answer is option 'B' - Bit-time.

Explanation:

The time interval between adjacent bits in a data stream is called the bit-time. It represents the duration of time it takes for one bit to be transmitted from the sender to the receiver.

To understand why the correct answer is option 'B', let's look at the other options and rule them out:

a) Word-time: A word refers to a group of bits transmitted together as a unit. However, the time interval between adjacent bits is not specifically related to words. Hence, word-time is not the correct answer.

c) Turnaround time: Turnaround time refers to the total time taken to complete a task, including the time spent on processing, waiting, and any other delays. It is not specifically related to the time interval between adjacent bits. Therefore, turnaround time cannot be the correct answer.

d) Slice time: Slice time is not a commonly used term in computer science or networking. It does not accurately represent the time interval between adjacent bits. Hence, slice time is not the correct answer.

Now, let's discuss why option 'B' - Bit-time is the correct answer:

- The bit-time is a fundamental concept in data communication and networking. It defines the duration of each bit in a data stream.

- In digital communication, data is transmitted as a series of bits (0s and 1s). Each bit has a specific duration, and the bit-time represents that duration.

- The bit-time is crucial in determining the overall data transmission rate. It helps in calculating the bandwidth and determining the number of bits that can be transmitted per unit of time.

- The bit-time is also used for synchronization purposes. It helps the receiver to correctly interpret the incoming data stream and extract the individual bits.

- In practical scenarios, the bit-time can vary depending on the transmission medium and the specific communication protocol being used.

In conclusion, the time interval between adjacent bits in a data stream is called the bit-time. It is a fundamental concept in data communication and networking, helping to determine the data transmission rate and ensuring proper synchronization between the sender and receiver.