In my time at HS (starting in '86, HS then lasted for 3+1 years, the last year being optional and only useful if you wanted to go to college) we had different language programs:
Spanish and Catalan during the 4 years (4 hours/week each). In other places in Spain, Catalan was replaced with the local language (Euskera or Galician) or replaced by other topics.
Foreign language, to choose between English and French, during the 4 years (4 hours/week)
Latin was mandatory in 2nd grade (15-16 y.o.) for everyone (3 hours/week IIRC). From 3rd grade on you had to choose between 4 branches:
STEM: No Latin (that was mine)
Socio-Economic: Latin as an option
Socio-Humanistic: Latin as an option
Humanistic: Choose between Latin and classical Greek. The other one was optional.
HS in Spain has changed a lot since I was there. Now they start younger and do 4+2 years (the first 4 being mandatory for every Spanish kid, until they are 16). Latin is not mandatory anymore for all that I know, but every HS should offer it to the 15-16y.o. students as an option. In the last 2 years of HS the 4 branches from above are now... 8 I think, but I'm not too sure how it works.
To keep the post on topic, I can't see Daphne or Scarlett choosing Latin as an option if that means rejecting a scientific topic.