Answer:
c.)coloradas
a.)privadamente
Step-by-step explanation:
The word missing in the first statement is a description of the subject "ears", which is in plural, so the word that describes "orejas" is "coloradas".
- Sus orejas están coloradas.
In the second statement, the best form of "privado" is "en privado", that's the way that's always being used in spanish. But, if you are obligated to use one of the given options, then "privadamente" should be the close one.
- Necesito hablar contigo privadamente.