The statement that must be true about the given circle is; D: RS ≅ ST
In Circle Q given, we see that ∠RQS ≅ ∠SQT.
From the given circle we can be able to say that line RS is congruent to line ST due to the fact that they are in the same plane and equal to each other.
Looking at the options, the one that best explains this congruency pattern is Option D.
Read more about Congruency at; https://brainly.com/question/5078920