What phrase appropriately completes the statement about adapting to new things?

The phrase "Just as" is appropriate for completing a statement about adapting to new things because it suggests a comparison between two situations or ideas, emphasizing similarity. This structure is often used to draw parallels, which can illustrate how adapting to new things may be similar to previous experiences or scenarios. For example, a complete statement could start with "Just as we learned to adapt to technology, we now must adapt to new social norms," highlighting a comparative relationship between two processes of adaptation.

The other phrases do not fit the context as well. "Just like" typically compares nouns directly rather than full situations or concepts. "Just about" suggests approximation or is used to indicate a near completion, which doesn't quite fit the theme of adaptation. "Just in case" introduces a precautionary element, usually related to preparedness, rather than facilitating a comparison about adaptation. Therefore, "Just as" is the most coherent choice for illustrating the process of adapting by drawing parallels to similar experiences.