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

A. $1$

B. $6$

C. $3$

D. $2$

E. $4$

$x$ | $y$ |

2 | 8 |

5 | 17 |

8 | 26 |

11 | 35 |

A. $1$

B. $6$

C. $3$

D. $2$

E. $4$