1. astronomers' ever-expanding knowlage of the universe has coinsided with the development of a collection of indirect distance measurment techniques.
a. the cosmic distance scale
b. the cosmic microwave background
c. light echo distance
d. differential galactic rotation

The best and most correct answer among the choices provided by your question is the first choice or letter A.

 Astronomers' ever-expanding knowledge of the universe has coincided with the development of the cosmic distance scale, a collection of indirect distance measurement.

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The correct answer is  "c".  it is "c" because melting is an endothermic change, and endothermic get's energy from surroundings.