The component of a solution which is present at a significantly greater concentration is known as the .

solvent

solute

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The component of a solution which is present at a significantly greater concentration is known as the solvent.

Explanation:

In a solution are present: solute (it is in smaller quantity and dissolves, example: salt) and solvent (it is in greater proportion and dissolves the solute, example: water).

Option c. 4686 kJ

Actually b and c, are the same.

Explanation:

This question requires a conversion of units:

1.12 millon calories = 1.12×10⁶ cal

1 cal = 4.187 J → 1 cal = 4.18×10⁻³ kJ

To make the conversion = 1.12×10⁶ cal . 4.18×10⁻³ kJ / 1 cal =  4689.4 kJ

≅ 4686 kJ