The correct option is A). skilled workers. The statement can be stated as Trade unions differed from labor unions in that trade unions were organized by skilled workers.
Trade union is an organization which mainly works with the motive to protect and advance the interests of its members in the workplace.
Labor union organization works with the motive of "maintaining or improving the conditions of the employment" of their members for better wages, reasonable hours and safer working conditions.
Trade unions are organized for a specific trade or occupation while labor union represent workers in a particular industry.
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