A dilation is a transformation that alters the size of an object while maintaining its shape. To determine which figure represents a dilation that has increased the size of the original object, you would look for a figure that appears larger than it typically would be in a realistic scale.
Without seeing the figures directly, I suggest considering which object might visually appear larger or exaggerated compared to its real-world proportions. For instance, if one of the objects, like the tree or house, is depicted much larger than what would be normal, it could be a good candidate for a dilation.
Typically, if you're performing a dilation, it might be more common to see architectural structures like a house represented in a larger scale as it can showcase the design more effectively. However, this can vary depending on the actual drawings.
If you choose among the figures, the tree (figure 2) or the house (figure 4) might be the best candidates for a scale drawing representing a dilation that increased size, but the answer would depend on their specific representations in the drawings you have.