Answer:
crystallized
Explanation:
There are two types of intelligence fluid and crystallized intelligence.
Fluid intelligence is the ability of a person to solve any new and unknown problems without the use of acquired knowledge.
Crystallized intelligence is abilities, skills and knowledge gained though the lifetime through experience, learning or studying. This intelligence is mainly used in test, quiz, and games shows and language usage.
Based on the situation given in the problem, Marilyn is adept in solving crosswords because of knowledge she had gained about crossword through experience and hence crystallized intelligence is the correct answer.