implementation shortfall components

CFA Level III Portfolio Management
#1

Which of the following measures cannot be used to analyse implementation shortfall?

Explicit trading costs.

_ Realized profits/losses due to price changes for trades taking one day to complete. _

Slippage costs.

B is the answer but not able to understand why because B is representing market or price impact which is a component of implicit cost in implementation shortfall.

thanks in anticipation

#2

Someone will surely answer this correctly, but my guess is maybe if the trade takes one day to complete and there is no Cancelation price, you can’t totally calculate Realized P/L? Just a guess, again wait for someone to hopefully give the right answer.