To answer this question correctly, let's analyze the options:
1. bring / boils: This option means "If you bring water to a boil, it boils at 100 degrees Celsius." This is a grammatically correct sentence and factually accurate, as water indeed boils at 100 degrees Celsius when subjected to normal atmospheric pressure.
2. will / boils: This means "If you will water to a boil, it boils at 100 degrees Celsius." This is not a grammatically correct sentence because "will" is used incorrectly here as a verb tense. The sentence structure is not proper.
3. bring / boil: This means "If you bring water to a boil, it boil at 100 degrees Celsius." While the first part "bring water to a boil" is correct, the “it boil” is grammatically incorrect in the context. "it" requires "boils" to maintain subject-verb agreement.
4. bring / will boil: This means "If you bring water to a boil, it will boil at 100 degrees Celsius." Although the first and second parts are correct individually, combining them is redundant because "bringing water to a boil" implies the action of water boiling is occurring.
Among these options, the most grammatically correct and factually accurate choice is:
○ bring / boils
So the completed sentence reads:
"If you bring water to a boil, it boils at 100 degrees Celsius."
Therefore, the correct answer is:
○ bring / boils
