Answer:
Option 2.
Explanation:
We need to find a polynomial which is written in descending order.
Polynomial written in descending order: If the terms are written in a manner such that the powers on the variables go from highest to lowest, then it is called polynomial in descending order.
In option 1, the given polynomial is

In option 2, the given polynomial is

In option 3, the given polynomial is

In option 3, the given polynomial is

Only in option 2, the terms are arranged in descending order of powers.
Therefore, the correct option is 2.