Hi Lucas.
The enlarged brackets can either be drawn (see CC Sample 10-15) or braille symbols can be used (see CC Examples 2-29 and 5-17). Your sample shows braille symbols for answer choice B. Since the bracketed structures are spatial arrangements, there is no need for a baseline indicator before Mg since it is on a different line. However, a baseline indicator *is needed before the opening enlarged bracket following the superscript 2+ because it is on the same line. There should be no space between the elements. See the attached BRF file.
– Lindy
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