Step 1: Understanding the context.
The question asks about the individual credited with popularizing the telephone greeting "Hello." The use of "Hello" as a greeting in telephone conversations is widely associated with one particular figure.
Step 2: Analyzing the options.
(A) Thomas Watson: Incorrect. Watson was the first to communicate using the telephone, but the credit for popularizing "Hello" goes to someone else.
(B) Alexander Graham Bell: Correct — Alexander Graham Bell, the inventor of the telephone, is credited with popularizing "Hello" as the standard telephone greeting.
(C) Thomas Edison: Incorrect. Edison was an inventor of various devices, but he was not responsible for popularizing "Hello."
(D) Adele: Incorrect. Adele is a famous singer, but she is not related to the invention or popularization of the telephone greeting.
(E) Lionel Ritchie: Incorrect. Lionel Ritchie, a famous musician, did not popularize the telephone greeting.
Step 3: Conclusion.
The correct answer is (B) Alexander Graham Bell, who is credited with popularizing the telephone greeting "Hello."