Robert is a stuntman planning to jump off a bicycle ramp and over an array of trucks. He identified a few quantitative relationships and modeled them:
Function | Input | Output
- | - | -
$S$| Height of the ramp, $r$ | Speed at the edge of the ramp, $S(r)$
$D$ | Speed at the edge of the ramp, $k$ | Distance of the jump, $D(k)$
$T$ | Distance of the jump, $x$ | Number of trucks Robert can jump over, $T(x)$
**The expression $S(T(x))$ represents which of the following?**
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