In order to write an email to a friend you should be a. en una reunion b. en una piscina c. en un equipo d. en linea

If you want to write an email to a friend you must have internet connection, which is colloquially known as being on line (en línea). If you do not have connection you will not be able to send the email.

Therefore, the answer is that you should be on line or:

If you have a device (equipo) with a good internet connection, it does not matter if you are in a meeting (reunión) or in a pool (una piscina).

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