Answer :
Even though Siobhan declined to receive emails from this company she purchased things from, they still sent emails which means that they violated D. Spam blocking.
What is spam blocking?
Spam blocking refers to any actions taken to ensure that certain messages that you don't want to see, do not get delivered to you.
Siobhan did not want to receive emails from the company and yet they sent emails anyway so this is a spam blocking violation.
Find out more on spam at https://brainly.com/question/17562633.