Explanation:

- The National Board for Micro, Small and Medium Enterprises typically meets periodically to discuss and make decisions regarding the MSME sector.

- Understanding the frequency of these meetings can help gauge how often key policy updates and decisions might be made.

Here are explanations of the options:

- Option 1: 1.9 months - This would imply meetings occur more than every other month, which is unusually frequent for such boards.

- Option 2: 2.3 months - This suggests meetings around five times a year, which might be more frequent than common practice.

- Option 3: 3.2 months - This would mean meetings occur slightly more than quarterly, around three to four times a year.

- Option 4: 4.6 months - This indicates meetings happen approximately twice a year, which aligns with the typical semi-annual meetings of many boards.

The correct answer is Option 4: 4.6.