Answer:
B. atrevidos
Step-by-step explanation:
- In spanish, adjectives must coincide in gender and number with the noun.
- In this case, the noun is plural, and masculine (because Maia y Samuel can be changed by "ellos", which is a plural noun used in all the cases that are not feminine plurals).
- Then, between the plurals adjectives (atrevidos and atrevidas) we chose the first one, because we are not talking about two females, but about a man and a woman.
- Note that, in every case where plurals are formed both by men and women (like this case), the plural adjective takes the form of a masculine plural.