Biology

The correct answer is: B.Small genetic changes accumulating over time leading to resistance.

Explanation:

In the case of antibiotic resistance, the process of gradual evolution occurs through the accumulation of small genetic changes over time. Bacteria can undergo mutations that give them a slight advantage in surviving exposure to antibiotics. Over generations, these mutations can accumulate, and the bacteria with the resistance traits survive and reproduce, leading to a population of bacteria that is increasingly resistant to the antibiotic. This is an example of gradual evolution in response to selective pressure (the presence of antibiotics).

The other options:...