Step 1: Picture a spending scale from careful with money at one end to wasteful with money at the other end. 'Frugal' sits at the careful, sparing end of this scale.
Step 2: Place each option on this scale. 'Thrifty', 'economical', and 'sparing' all describe careful use of money or resources, so they sit at the same end of the scale as frugal, not the opposite end.
Step 3: 'Extravagant' describes spending far more than necessary, freely and often wastefully, placing it at the opposite end of the scale from frugal.
Correct option: (2) Extravagant.