Answer: B) Comfort.
Step-by-step explanation: Connotation of a word is the meaning given or implied by the context or even by the readers, based on their emotions and personal experiences. It is the antonym of denotation which is the literal meaning of the word. In the given sentence, the word "solace" is used to express the consolation Rebecca felt in the arms of her mother, so, in this context the best synonym of "solace" is "comfort."