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Math·Advanced Math·Equivalent expressions

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For the exponential function $f$, the value of $f(1)$ is $k$, where $k$ is a constant. Which of the following equivalent forms of the function $f$ shows the value of $k$ as the coefficient or base?

A

$f(x)=50(1.4{)}^{x-1}$

B

$f(x)=70(1.4{)}^x$

C

$f(x)=98(1.4{)}^{x+1}$

D

$f(x)=137.2(1.4{)}^{x-2}$