Final answer:
The true statement is Option 3: Segment ef over segment lm equals segment eg over segment lm.
Step-by-step explanation:
The statement that is true is Option 3: Segment ef over segment lm equals segment eg over segment lm.
In a similarity ratio between two similar triangles, the ratios of corresponding sides are equal. This means that if δefg ~ δlmn with a ratio of 2:1, then the ratio of segment ef over segment lm is also 2:1. Similarly, the ratio of segment eg over segment lm is also 2:1. Therefore, Option 3 is correct.