Concept notes: Kolkata, the capital of West Bengal, is known for its rich cultural heritage and modern transport systems. The city is often referred to as the "City of Joy" due to its vibrant culture and historical significance. The transport system in Kolkata includes the Metro, ships, and traditional modes like human-powered rickshaws, though the latter is declining due to modernization.
Explanation: Kolkata, the capital city of West Bengal, is a vibrant metropolis with a rich cultural heritage and a diverse transport system. The city is often referred to as the "City of Joy," a nickname that reflects its lively cultural scene, historical significance, and the warm hospitality of its people. This nickname is deeply ingrained in the city's identity and is widely recognized both nationally and internationally.
The transport system in Kolkata is a blend of modern and traditional modes. The city has a well-developed Metro system, which is a significant part of its public transport infrastructure. Additionally, Kolkata is situated on the banks of the Hooghly River, and river transport, including ferries and ships, plays a crucial role in the city's daily life. These modern transport systems cater to the growing population and the increasing demands of urban mobility.
However, the city also has a long-standing tradition of human-powered rickshaws, which have been a part of Kolkata's transport landscape for many years. These rickshaws, pulled by人力车在加尔各答的存在正在逐渐减少，因为这些车辆不再被制造。这反映了城市现代化进程中的一种趋势，即传统交通工具逐渐被更现代、更高效的交通工具所取代。尽管人力车在加尔各答仍然存在，但它们的数量正在减少，这表明这种传统交通工具的使用正在逐渐减少。
综上所述，选项D是正确的，因为它包含了两个正确的陈述：人力车的存在正在减少，以及加尔各答被称为“欢乐之城”。而选项A、B和C都包含了不正确的陈述2，因此是错误的。