Context: The Karnaphuli Tunnel project has been completed to connect Chattogram’s port area with the southern districts by passing under the Karnaphuli River. The tunnel is celebrated as a major modern infrastructure milestone that improves connectivity, trade, and safety while showcasing engineering capability.

a. Write a composition entitled "The Karnaphuli Tunnel: A Gateway to Progress" (about 200 words).

b. List three major economic or social benefits that the tunnel provides. (Give brief explanations.)

c. Describe two significant engineering or environmental challenges faced during construction and how they were addressed.

d. Write one strong concluding sentence that highlights the tunnel's symbolic importance to the nation.