Answer:
Pet owners are encouraged to register <em><u>for</u></em> the workshop on pet training and health offered by the community center.
Explanation:
The word "for" is a preposition that can be used for all types of tenses, be it present, past, or future. Its use depends on the sentence and can be used to indicate the time or duration of an event or action or to specify the use of something.
In the given sentence, "for" is used to refer to the event that pet owners must register. This means that it tells us the "what for" of the sentence.
Thus, the final sentence will be
Pet owners are encouraged to register <em><u>for</u></em> the workshop on pet training and health offered by the community center.
The answer to the question you have asked a frequent brainly user is D
I think it’s D, but I’m not sure. While talking in real life we people often use simple words.