For this question, if one of the given options was 2π (6.28), which would be the length of **arc** RT, should we be selecting that instead of the given answer i.e. D) 4 ?

Yes, you are right. The maximum distance between the two points is 2π which could be the correct answer.

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The line segment between two points R & T on a circle is called a chord.

The longest possible chord would be a diameter of length 2r.

in this case giving a maximum length for RT of 4 units.

Thanks for confirming!

Yep, that right