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Answer:
A. People in the 21st century have access to advanced smartphones, whereas those in the 20th century relied on landline telephones.
Explanation:
This statement best contrasts the experiences because it directly compares a specific technology (smartphones) widely used in the 21st century with a technology (landline telephones) that was prevalent in the 20th century. It highlights the significant leap in communication technology and accessibility, showing a clear difference in how individuals connect and communicate across the two centuries.