Climate change is expected to affect tropical and temperate species differently. Select the statement that best describes which type of species is more at risk, and why.

A. Tropical species, because they have a narrow performance curve with a small thermal safety margin.
B. Tropical species, because they have a broad performance curve with a large thermal safety margin.
C. Temperate species, because they have a narrow performance curve with a small thermal safety margin.
D. Temperate species, because they have a braod performance curve with a large thermal safety margin.