The minister avoided any mention of the issue of women’s reservation in the private sector. He was accused of the-------------------------- issue.

To find the correct word to fill in the blank, let us analyze the context of the sentence:

The first sentence states: "The minister avoided any mention of the issue of women’s reservation in the private sector."
This tells us that the minister deliberately avoided discussing or dealing with the issue.

The second sentence is: "He was accused of the -------------------------- issue."
We need a verb in the gerund form (-ing) that means "avoiding" or "sidestepping" a topic or issue.

Let's look at the definitions of the options:
1. Collaring: To collar means to seize, arrest, or grab someone by the collar.
2. Skirting: To skirt an issue means to attempt to ignore, avoid dealing with, or bypass a difficult topic/problem.
3. Tying: To tie means to bind or fasten with a cord or rope.
4. Belting: To belt means to beat with a belt or to sing loudly.

Since the minister "avoided any mention" of the issue, he was accused of skirting the issue.

Therefore, the correct answer is skirting.