The table to the right table gives the top five movies at the box office this week

Identify the variable under consideration in the fourth column?

$\backslash$table$[[$Rank$,$Last week,Movie title,Studio,Sales $($$ millions$)],[1,$N$/$A$,$Pirate Adventure,Movie Giant,$35\mathrm{.}2],[2,2,$Secret Agent Files,G$.$M$.$G$,19\mathrm{.}5],[3,1,$Epic Super Hero Team,$21$st Century,$14\mathrm{.}3],[4,5,$Reptile Ride,Movie Giant,$10\mathrm{.}1],[5,4,$Must Love Cats,Dreamboat,$9\mathrm{.}9]]$

A$.$ movie title

B$.$ box office sales

C$.$ rank

D$.$ studio name