**Answer: first option**

**Step-by-step explanation:**

** **Direct variation equation has the following form:

Where "k" is the constant of variation.

In direct variation when the variable "x" increases, the variable "y" increases by the same factor and when the variable "x" decreases, the variable "y" decreases by the same factor.

Inverse variation equation has the form:

Where "k" is the constant of variation.

In inverse variation when the variable "x" increases, the variable "y" decreases by the same factor and when and when the variable "x" decreases, the variable "y" increases by the same factor.

Given the equation:

You can observe that "r" varies directly with "l" and inversely with "p" and "t"