<u>Answer:</u>
<em>Cadmium, Zinc, and Mercury are the three transition elements from the periodic table in group 12.
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<em>Option: B
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<u>Explanation:</u>
Periodic table consists of all chemical elements in a tabular form which are arranged according to <em>electronic configuration, atomic number and chemical properties.</em> Every chemical elements are divided into groups have same chemical behaviours.
Both <em>non-metals and metals</em> are included in periodic table which are again divided into different group of elements. From those transition elements are the elements have <em>half-filled f or d subshell.
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<em>These transition elements consists of groups from 3 to 12. In group 12 Mercury, Zinc, and Cadmium are the transition elements. </em>