Explanation:

- The sentence "A visit in Ladhak is a must these days" uses "in," which is not the best preposition here.

- Option 1: "from" - This suggests origin and is not suitable for this context where we talk about visiting a place.

- Option 2: "to" - This is often used with "visit" to indicate the destination. "A visit to Ladhak" means someone is going to Ladhak.

- Option 3: "for" - This can imply purpose, like visiting for a specific reason, but does not fit well with the context of associating a visit with a place.

- Option 4: "at" - This is used for more specific locations or events, like "at a store” or “at a concert," not for a wider area like Ladhak.