When was the first e-mail sent?

The correct answer is C. 1971.

Ray Tomlinson, an American computer programmer, sent the first email on ARPANET, a precursor to the internet, on October 29, 1971. He sent the email from one computer to another computer on the same network, using the @ sign to separate the user name from the machine name.

Option A is incorrect because the first email was not sent in 1963.

Option B is incorrect because the first email was not sent in 1969.

Option D is incorrect because the first email was not sent in 1974.