Question

what can you use as a substitute for dumbbells?
a sheet of paper
a jug of milk
a pencil

Explanation:

Dumbbells are used for weight - based exercises, so we need an object with significant weight. A sheet of paper is very light, and a pencil also has little weight. A jug of milk has a certain amount of weight (due to the milk inside and the jug itself), so it can be used as a substitute for dumbbells to provide resistance during exercises.

Answer:

B. A jug of milk