Concept:The word "Delving" means to search deeply or investigate thoroughly.
We need to choose the word that closely matches this meaning of deep inquiry.
Explanation:"Delving" comes from the idea of digging into a subject or exploring it in great detail.
Let us check each option.
"Inquisition" means a formal or detailed investigation or questioning, which matches the deeper sense of delving.
"Scratch" suggests only a surface-level effort, not deep exploration.
"Dabble" means to take part without serious involvement, so it is the opposite of delving.
"Skim" means to read or look through quickly and lightly, again not deeply.
Therefore, the most suitable synonym for "Delving" is "Inquisition".
Answer:Option A. Inquisition