Question

which of these innovations was made possible by alexander graham bell?
instant communication through the written word
instant communication between trains
instant communication through speech
instant communication using a special code

Explanation:

Alexander Graham Bell is known for inventing the telephone, which enables instant communication through speech. The first option refers to written communication (like telegraph or email - related, not Bell's work), the second about train communication isn't his innovation, and the fourth (using special code like Morse code) was developed by others. So the correct option is the one about instant communication through speech.

Answer:

C. instant communication through speech (assuming the options are labeled A, B, C, D with C being "instant communication through speech")