Concept:A cloud storage service saves files on remote servers and lets users access them online from any device.
Explanation:• Cloud storage services allow users to upload, store, and share files over the internet.
• Dropbox is a clear example because it provides online file storage and synchronization.
• Yandex is a technology company and search engine, not primarily a cloud storage service.
• DuckDuckGo is a privacy-focused search engine.
• Adobe XD is a user experience and interface design tool.
• Therefore, the only option that is a true cloud storage service is Dropbox.
Answer:B. Dropbox