SAT Question ba62b0b0: Ratios Rates Proportional Relationships And Units answer and explanation with Desmos solution

Choice A is correct. It's given that a kangaroo has a mass of $28$ kilograms and that $1$ kilogram is equal to $1,000$ grams. Therefore, the kangaroo's mass, in grams, is $28\text{kilograms}\left(\frac{1,000\text{grams}}{1\text{kilogram}}\right)$, which is equivalent to $28,000$ grams.