To convert 35 pounds to kilograms using the ratio 1 pound equals about 0.45 kilograms, you can use the following calculation:
\[ 35 \text{ pounds} \times 0.45 \text{ kg/pound} = 15.75 \text{ kg} \]
Therefore, 35 pounds is equal to 15.75 kilograms. The correct response is:
15.75