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The correct answer choice is option 4: Mumbai-Pune. An expressway refers to a broad, multilane roadway designed for high-speed traffic with controlled entry and exit, blockade of cross traffic, and often grade-separated intersections.
Option 1, Ahmedabad-Vadodara, is not the correct answer as they are joined by an expressway, but not a 6-lane one.
Option 2, Dhaka-Chittagong, is within Bangladesh, which is not stated in the question so it cannot be considered. Furthermore, there is no known 6-lane expressway connecting these two cities.
Option 3, Islamabad-Lahore, is also not correct. Although there is an expressway between these cities, it is a motorway.
Finally, option 4 is the correct answer as Mumbai and Pune have been connected by the Mumbai-Pune Expressway, which is a controlled-access highway and India`s first six-lane concrete, high-speed expressway. It spans a distance of 94.5 km connecting Mumbai, the capital of Maharashtra and the financial capital of India, with Pune, the cultural and educational capital of Maharashtra.