What does the word "females" probably mean in this passage

A．you'll soon be living in a cleaner building
B．rubbish chutes will become out of date before long
C．you won't wait long for your turn to recycle rubbish
D．it won't be long before you'll have to recycle your rubbish

A．it reduce the cost of recycling
B．it saves time and space
C．it saves money for people in high rises
D．it makes better use of the existing recovery equipment