BERLIN (Reuters) - European passenger car sales slumped in April as the first full month with restrictions imposed to contain the coronavirus pandemic across the continent dragged sales to a record drop, data showed on Tuesday.In April, new car registrations dropped by 78.3% to 292,182 vehicles in the European Union, Britain and the European Free Trade Association (EFTA) countries, statistics from the European Auto Industry Association (ACEA) showed.Sales recorded a double-digit fall in all EU..