Activity of Various Enzymes at Various Temperatures (A) and at Various

Activity of various enzymes at various temperatures (a) and at various pH (b) .
-Which curve(s) on the graphs may represent the temperature and pH profiles of an enzyme taken from a bacterium that lives in a mildly alkaline hot springs at temperatures of 70°C or higher?

A) curves 1 and 5
B) curves 2 and 4
C) curves 2 and 5
D) curves 3 and 4
E) curves 3 and 5