Final answer:
To catch a ferry from southern Spain to Tetuán, Morocco, you would travel from Madrid to Tarifa, although it is not one of the provided options. Málaga is the closest city among the given choices, but most ferries to Morocco depart from either Tarifa or Algeciras.
Step-by-step explanation:
To travel from Madrid to catch a ferry to Tetuán in Morocco, you would go to the city of Tarifa. Tarifa is the southernmost port city of Spain, located in the province of Cádiz, and is the closest point in mainland Europe to North Africa. The Strait of Gibraltar separates North Africa from the Iberian Peninsula and connects the Mediterranean Sea with the Atlantic Ocean. The distance across the strait is about nine miles, offering one of the shortest crossings from Europe to Africa.
Therefore, the correct answer is not explicitly listed in the provided options (a) Málaga (b) Seville (c) Valencia (d) Granada; however, among them, Málaga has a port and is geographically closest to Morocco compared to Seville, Valencia, and Granada. It is worth noting for clarity that while Málaga is closer than the other options provided, ferries to Tetuán typically depart from Tarifa or Algeciras, which are to the west of Málaga.