Drag-drop into text & Select missing words questions: not clear if the [[1]] placeholders refer to choices or groups

When creating drag-drop into text or select missing words questions, you write the question text including placeholders like [[1]] [[2]] for where the choices will go:

Then you fill in the choices, which each belong to a group. At the moment, but Choices and Groups are referred to by numbers:

In some training sessions, we have observed that users sometimes get confused whether the [[1]] placeholders refer to Choice number or Group number. (The answer it that it is Choice number.) We propose to change:

• When editing a Drag-drop into text or Select missing words question, the lables for each choice should be Choice [[1]], Choice [[2]], ... to match the [[1]], [[2]] placeholders that are present in the question text.
• When editing a Drag-drop into text, Drag-drop onto image or Select missing words question, the different groups should be indentified as A, B, C, ... rather than 1, 2, 3, ... (This change only affects what is visible in the form. Not what is stored in the database.)

There is a potential issue that Moodle has been translated into languages which may not use the Latin alphabet. However, I discussed with with David Mudrak, and we agreed that using A, B, C, ... to identify things, rather than 1, 2, 3, ... is not fundamentally worse, so this is OK.