Final answer:
The counter-proposal by Aldo Rossi in the 1970s was titled 'Les Halles, Counter-Proposal', which aimed to preserve the historical and cultural significance of the district while incorporating modern elements.
Step-by-step explanation:
The correct title of the counter-proposal by Aldo Rossi in the 1970s is Les Halles, Counter-Proposal. Aldo Rossi, an Italian architect and theorist, presented this alternative plan for the redevelopment of Les Halles, a district in Paris, France. His design aimed to preserve the historical and cultural significance of the area while incorporating modern elements.