The answrr is C) The major goal is to strenghten trade within Europe
In the one of the treaties signed in 1992 you can read this
RESOLVED to achieve the strengthening and the convergence of their economies and to establish an economic and monetary union including, in accordance with the provisions of this Treaty, a single and stable currency,
DETERMINED to promote economic and social progress for their peoples, within the context of the accomplishment of the internal market and of reinforced cohesion and environmental protection, and to implement policies ensuring that advances in economic integration are accompanied by parallel progress in other fields,