Final answer:
The best synonym for 'unsnare' is 'release', as both words relate to the act of freeing from a confined or entangled state.
Step-by-step explanation:
The word unsnare in the context given suggests the action of freeing or releasing from a trap or entanglement. Therefore, the best synonym for unsnare would be release. The options provided were A. Trap, B. Release, C. Ensnarl, and D. Entangle. Trap, ensnarl, and entangle all suggest some form of capturing or tangling, thus having a meaning opposite to unsnare. On the other hand, release conveys the act of setting something free, which directly aligns with the definition of unsnare.