The chemical and physical properties of Fluorine, Chlorine, Bromine, and Iodine have been similar. Thus option B is correct.
The physical and chemical properties of the elements have been based on the presence of the valence electrons in the element. The valence electrons are responsible for the reactivity of the element, and thereby the physical and chemical properties.
The elements belonging to the same group have been consisted of the same number of valence electrons, and thereby possess similar chemical and physical properties.
In the given set of options, Fluorine, Chlorine, Bromine, and Iodine have been belonging to the same group 17, and all have 7 valence electrons. The chemical and physical properties of these elements have been similar. Thus option B is correct.
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