Concept:"Deplore" means to feel or express strong disapproval, so its opposite is approval or praise.
Explanation:The word "deplore" means to strongly disapprove of something.
For example: The council deplores vandalism in the park.
"Praise" means to express warm approval or admiration.
For example: The teacher praised the student for her excellent performance.
Thus, "praise" is the direct antonym of "deplore".
The other options are related in meaning to "deplore", not opposite to it:
Mourn means to feel deep sorrow.
Dislike means to feel aversion.
Hate means to feel intense dislike.
Therefore, the correct opposite is "praise".
Answer:Option B: praise