Answer: The correct answer is absorb.
Step-by-step explanation:
In the given problem, It was a cold, sunny day and the ground was covered with fresh snow. Maria wore her black sweatshirt outside to play in the snow.
A black color is a good absorber while the white color is good reflector.
Black objects absorb all the incident radiations which falls on them regardless of the frequencies of the radiations while the white reflects all the incidents radiations completely.
Therefore, she knew that black would absorb light waves and help keep her warm.