Jalen is \(7~\text{years}~\text{older}\) than his sister and is \(19~\text{years}~\text{old}\). Let \(a\) be his sister's age. Verify the candidate equation structures, then solve the valid equation. Report its letter followed by her age.

A. \(a~+~7~=~19\)
B. \(a~-~7~=~19\)
C. \(19~+~7~=~a\)

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B; a = 26 years

C; a = 26 years

A; a = 19/7 years

A; a = 12 years

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Curriculum context

Course: Math Foundations
Standard: MF.EQ.9
Category: Pre-Algebra
Domain: Equations
Objective: Write and solve a linear equation from a short verbal or contextual situation.
Problem type: Pick the right equation from several choices