Transportation lag refers to the delay or latency that occurs during the transfer of materials or information in a system. It is a common phenomenon in various systems, including transportation networks, communication systems, and industrial processes. The correct answer to this question is option 'B', which states that transportation lag is seen when the time taken to transfer is large. Let's explore this answer in detail.

Explanation:
Transportation lag can occur due to various factors, including the distance between the source and destination, the speed of the transportation medium, and the efficiency of the transfer process. When the time taken to transfer the materials or information is large, it leads to transportation lag. This lag can have several consequences and impacts on the overall system.

Impact of Transportation Lag:
1. Delays: Transportation lag can cause delays in the delivery of materials or information. This can have significant implications in various industries, such as manufacturing, logistics, and supply chain management. Delays can result in increased costs, decreased efficiency, and customer dissatisfaction.

2. Inefficiency: When there is a significant transportation lag, it indicates an inefficient transfer process. Inefficient systems can lead to wastage of resources, increased energy consumption, and reduced overall system performance.

3. Bottlenecks: Transportation lag can create bottlenecks in the system. Bottlenecks are points in the system where the flow of materials or information is restricted, leading to congestion and reduced throughput. Identifying and resolving bottlenecks is crucial for improving system performance.

4. Planning and Scheduling: Large transportation lag can make planning and scheduling more challenging. It becomes difficult to predict the arrival or completion time of transfers accurately. This can affect production schedules, project timelines, and overall operational efficiency.

5. Quality and Reliability: Transportation lag can also impact the quality and reliability of the transfer process. For example, in communication systems, high latency can lead to signal degradation or loss, affecting the quality of communication.

Conclusion:
Transportation lag is seen in systems when the time taken to transfer materials or information is large. It can result in delays, inefficiency, bottlenecks, and challenges in planning and scheduling. Understanding and addressing transportation lag is crucial for improving system performance, reducing costs, and enhancing customer satisfaction.