(B) : In viruses,three architectural forms are found: helical (elongated body,e.g.,$TMV$),cuboidal (short broad body with rhombic,rounded,polyhedral s

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All of them have helical symmetry.

(B) : In viruses,three architectural forms are found: helical (elongated body,e.g.,$TMV$),cuboidal (short broad body with rhombic,rounded,polyhedral shape,e.g.,poliovirus),and binal (with both cuboidal and helical parts,e.g.,$T_2$ phage). Therefore,the statement that all viruses have helical symmetry is incorrect.