Select the word that fits the analogy Do : Undo : : Trust : __________

The correct option is Distrust.

An analogy shows a relationship between two pairs of words. To solve the analogy Do : Undo :: Trust : __________, we must determine the relationship between the first pair of words and apply that same logic to the second pair.

1. Analyze the first pair (Do : Undo):
The word "Undo" is formed by adding a prefix to "Do" to create its direct opposite or antonym. Therefore, the relationship between "Do" and "Undo" is one of antonyms (opposite meanings).

2. Apply the relationship to the second pair (Trust : __________):
We need to find the antonym of "Trust". The prefix used to form the opposite of "Trust" is "dis-", giving us "Distrust", which means a lack of trust or confidence.

Therefore, the word that correctly completes the analogy is Distrust.