What is an ice age?

a; a recent increase in the average global temperature near earth’s surface
b; a period of time when temperatures across the planet are colder than normal
c; a characteristic of winter that returns seasonally
d; the loss of heat in coastal areas from la niña storms

Which of these is an example of pseudoscience? a) predicting the time of sunrise based on data on position of earth b) predicting the date of the moon phases based on data on position of earth c) predicting eclipses based on the position of the sun and the moon d) predicting future events in a person's life based on the position of the moon