Which of the following is a pair of like decimals?

The correct option is D. $9865.4946,28.4900$

Decimal numbers having the same number of decimal places, i.e. decimals having the same number of digits on the right of the decimal point, are known as like decimals.

In the option with the numbers $9865.4946$ and $28.4900$, both decimal numbers have $4$ digits in the decimal place.

Therefore, they are like decimals.

The rest of the options do not have same number of decimal places.