A. discarding
B. boarding
C. collecting
D. saving
squandering : waste (something, especially money or time) in a reckless and foolish manner.
discarding : get rid of (someone or something) as no longer useful or desirable.
boarding : long, flat, thin pieces of wood used to build or cover something.
collecting : bring or gather together (a number of things).
saving : the money one has saved, especially through a bank or official scheme.
Antonym of squandering is saving
