Well words like "Que" and "estas" should be easy to know what they mean which is "What" and "are you doing" or "at" estas can have multiple purposes
Pensando means thinking so the sentence means "What are you thinking"
practice at home to get better it works
your answer will be A:Mayor because it describes mi hermanito meaning little brother so there fore your mom is older which is "mayor".
Los autobuses is the plural
since it’s yourself then that means you’ll get “les” for that sentence
