Show answer and explanation
B religious education. Religionsunterricht teilnimmt.
Why?
The Basic Law gives parents the right to decide whether their child takes part in religious education (Religionsunterricht) at school. From age 14 young people may decide this themselves. Other subjects like history or language are compulsory, so parents cannot simply take their child out of them.
Erklärung auf Deutsch
Das Grundgesetz gibt den Eltern das Recht zu entscheiden, ob ihr Kind am Religionsunterricht teilnimmt. Ab 14 Jahren darf das Kind selbst entscheiden. Fächer wie Geschichte oder Sprachen sind Pflicht.
Remember: Religion is a personal choice: parents decide until 14, then the child.