Answer:
B. They have the same size but are not the same.
Explanation:
Two figures are said to be congruent if they have the same shape and size.
We can elaborate this as the two figures whose corresponding sides and corresponding angles are same, are congruent.
Shapes that have same shape but different size are said to be similar.
The following best describes similar figures that are not congruent.
Option B - They have the same size but are not the same. This says that the size is same but the figures are not identical or congruent.