You are given a question or fill-in-the-blank question, two answer options (Option1 and Option2) and an Explanation. Your task is to find the correct answer (return the string of the correct option, not option1/2) for the given question from the given options and using explanation.

Q: Question: Fred has an isotope that decays quickly. What is likely true about it? 
 Option1: it can be used to date older specimens 
 Option2: it can't be used to date old specimens 
 Explanation: Because these isotopes decay more slowly, they can be used to date much older specimens.

A: it can't be used to date old specimens
****
Q: Question: When a rabbit farmer begins a farm he starts with many rabbits. If the rabbits are not cared for and fed does the population 
 Option1: decrease 
 Option2: increase 
 Explanation: With exponential growth, the population starts out growing slowly. As population size increases, the growth rate also increases.

A: decrease
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Q: Question: If Jim raises the temperature of water in his bathtub, what happens to the density of the water? 
 Option1: decreases 
 Option2: increases 
 Explanation: Water becomes more dense when it is colder and when it has more salt.

A:
decreases
****