Answer:
The answers are Fluorine and Francium.
Explanation:
Fluorine has the highest affinity for electrons while Francium has the lowest affinity for electrons. This can be measured by the electronegativity of each one, where Fluorine is the most electronegative element. This can also be seen by the accommodation of elements in the periodic table.
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B is the answer to your question.
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The expected result of this poison on secondary active transport is that the poison will prevents the conformational changes which are necessary for the pump to perform its function, thus preventing it from been able to carry out transportation of ions in and out of the cell.