Words given on the left side of (::) are related with each other by some Logic/Rule /Relation. Select the missing word/word pair on the right side of (::) from the given alternatives based on the same Logic/Rule/Relation.

Car : Steering :: Fan : ?

Blade

Car : Steering :: Fan : ?

The logic followed here is :

Car : Steering

Steering is an important part of car to drive

Similarly

Blade is an important part in move Fan to provide Air