Explanation:

To send an email, we need two things: a device to compose and send the email, and an internet connection to transmit the email to the recipient's email server. Considering the options given, the correct answer is option 'B': Smart phone, Tablet.

Smartphone:
- A smartphone is a mobile device that allows us to make calls, send text messages, browse the internet, and perform various other tasks.
- Smartphones are equipped with email apps that allow us to compose, send, and receive emails.
- We can access our email accounts on smartphones by configuring the email app with our email credentials.

Tablet:
- A tablet is a portable device that is larger than a smartphone but smaller than a computer.
- Tablets provide similar functionality to smartphones, including the ability to send and receive emails.
- Tablets usually have larger screens, making it easier to compose and read emails compared to smartphones.
- Like smartphones, tablets also have email apps that can be configured with our email accounts.

Other Options:
- Smartphones and tablets are the most common devices used to send emails due to their portability and convenience.
- Computers are also commonly used for sending emails, as they provide a larger screen, a physical keyboard, and more advanced email client applications.
- However, the options of a computer and a newspaper (option 'C') or a computer and a refrigerator (option 'D') are not valid choices for sending emails.
- Newspapers are traditional printed media and do not have the capability to send emails.
- Refrigerators are household appliances used for storing food and beverages and do not have the functionality to send emails.

Therefore, the correct answer is option 'B': Smart phone, Tablet, as smartphones and tablets are portable devices equipped with email apps that allow us to send emails.