Answer: Choice #3
Explanation: The vocabulary and sentence structure are better put together and more advanced.
Her parents are being thrifty, which means they're using money carefully by choosing a brand that even if it's not the most well known, it's good.
Answer:
This temperature is on the order of billionths of a kelvin for black holes of stellar mass, making it essentially impossible to observe. Objects whose gravitational fields are too strong for light to escape were first considered in the 18th century by John Michell and Pierre-Simon Laplace.
Explanation: