He 'd heard about this phenomenon known as a firefly , and Mommy and Daddy were about to introduce him to some . Alas , once we got outside , none of the creatures could be spotted , but , in those moments , we fully experienced the anticipation of introducing our son to some of the wonders of this life . That 's what makes parenting worthwhile .

Based on the preceding passage, choose your answer for question What may be the reason they were n't seeing fireflies ?
Select from: a). They did n't want to go in a jar .; b). They did n't want to be stepped on .; c). They were hiding from them .; d). None of the above choices .;
The answer is:
d).