When I took the ¿Cómo Estás? A2 Kwiz related to this subject, this question below was marked wrong ("feliz" in red), saying my answer should have been "contenta". Since they both refer to being Happy, can you explain why Contenta is better in this sentence?
MARÍA: Venga chicas, ¡ánimo! Yo estoy muy feliz, ¡tengo un trabajo nuevo!