Business and leisure travel often overlap.

The correct answer is true.

It is true that business and leisure travel often overlap. Although people travel for business purposes they see these kinds of trips as a good chance to meet new people, new places, visit the city, and taste new food. After office hours or at the end of the business meetings, people oftentimes take time to walk the streets of the city, visit the downtown or visit interesting places such as museums.

the andes or andean mountains (spanish: cordillera de los andes) are the longest continental mountain range in the world, forming a continuous highland along the western edge of south america. this range is about 7,000 km (4,300 mi) long, about 200 to 700 km (120 to 430 mi) wide (widest between 18° south and 20° south latitude), and of an average height of about 4,000 m (13,000 ft). the andes extend from north to south through seven south american countries: venezuela, colombia, ecuador, peru, bolivia, chile and argentina.

from wikipedia

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the answer for 3 is b and the answer for 4 is d