Choose the One Alternative That Best Completes the Statement or Answers

Choose the one alternative that best completes the statement or answers the question.
Write a mathematical expression for the quantity described verbally.
-A salary after a $5.1 \%$ increase, if the original salary is x dollars

A) $0.051 \mathrm { x }$
B) $6.1 \mathrm { x }$
C) $1.051 \mathrm { x }$
D) $5.1 \mathrm { x }$