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.
Example: Question: The government of Canada is considering implementing less carbon taxes across the country. If these taxes were implemented, the amount of carbon dioxide emissions in the country would be expected to 
 Option1: fall 
 Option2: rise 
 Explanation: The carbon taxes encourage people to use less fossil fuel, which reduces carbon dioxide emissions.
Example solution: rise
Example explanation: As mentioned in the Qualitative Statement, due to taxes people will reduce usage of fossil fuel and hence, carbon dioxide emission will also reduce. So, if Camada government decrease the tax, people will use it more and hencce, emission will also incerase.

Problem: Question: Would a sudden warm spell that halved the size of glaciers 
 Option1: increase sea level 
 Option2: decrease sea level? 
 Explanation: An increase in glaciers lowers sea level and a decrease in glaciers raises sea level.

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Solution: increase sea level