Okay, here we have this:
Considering the provided information, we are going to identify the pattern, so we obtain the following:
We can observe that the change is constant, so it means that the function is linear, therefore we will find the slope and the intercept with and thus obtain the equation that defines the pattern, then we have:
Slope=(y2-y1)/(x2-x1)
Slope=(285-300)/(1-0)
Slope=(-15)/1
Slope=-15
And the y-intercept is the value that °C takes when t is equal to zero, so in this case it is 300. Then finally we obtain that the equation is: 300-15t.
Then the correct answer is the option A.