Answer:
B: A mouse that inherited a strong sense of smell from its parents
D: A mouse with black fur that passed down through a gene
Step-by-step explanation:
In the article, it's stating that natural selection affects variations that are inherited, not acquired. Inherited means that that it's passed from parents to offspring through genetics. Acquired traits are "acquired" during an organism's life and develop.
Options B and D are correct because a strong sense of smell from its parents and genetically passed black fur are inherited traits. Only inherited traits can be affected by natural selection.