The following table shows $\left(x, \; y\right)$ values for a linear function. What is the slope of this function?

A. $2$

B. $3$

C. $6$

D. $8$

E. $1$

$x$ | $y$ |

3 | 5 |

4 | 7 |

7 | 13 |

9 | 17 |

A. $2$

B. $3$

C. $6$

D. $8$

E. $1$