Answer
The soil of the field cools off faster than the parking lot.
Work Step by Step
From the equation for specific heat, $c=\displaystyle \frac{Q}{m\Delta T}$,
we read the relationship between $c$ and $\Delta T$ to be inversely proportional, given Q and m remain unchanged.
So, the concrete, with greater c, experiences less temperature change, given the conditions.
The soil cools off faster.
