In a habitat, giraffes' necks differ in size. Some have shorter necks and some have longer necks. A drought occurs and the lower-lying shrubs in the area die off. Which of the following is a plausible explanation of what may happen to the giraffe population due to this change?Almost immediately, the giraffes with shorter necks would decrease in population, and the giraffes with longer necks would increase in population.

a. Over time, the giraffes with shorter necks would decrease in population, and the giraffes with longer necks would increase in population.

b. Over time, the giraffes with longer necks would decrease in population, and the giraffes with shorter necks would increase in population.

c. Almost immediately, the giraffes with shorter necks would decrease in population, and the giraffes with longer necks would increase in population

d. Almost immediately, both the giraffes with shorter necks and the giraffes with longer necks would decrease in population.