1 day = 24 hours，$$1$$ hour = 60 minutes，$$1minute$$ = 60 seconds，$$24$$ days = (24 x 24) hours = [(24x 24) x 60] minutes = 24x 24x 60x 60 seconds 
Which of the following calculations shows how to work out the number of seconds in~~24 days? 
Options:
A. 24 x24~ 
B. 24 x~60 
C. 24 x~24 x~60 
D. 24 x~60 x~60 
E. 24 x~24 x~60 x~60 