Alleviate : Aggravate :: Elastic : ____________
Step 1: First pair analysis.
"Alleviate" means to lessen, while "Aggravate" means to worsen → they are opposites.
Step 2: Apply same relation.
"Elastic" means flexible/stretchable. Its opposite is "Rigid" (not flexible).
Step 3: Verify options.
- (a) Rigid → opposite of elastic → correct.
- (b) Flexible → synonym, not opposite.
- (c) Malleable → bendable, not opposite.
- (d) Strong → unrelated. \[ \Rightarrow \boxed{\text{Rigid is the correct answer.}} \]