Select the most appropriate idiom that can substitute the underlined segment in the given sentence.
His old car has become a financial burden on him now.

* A white elephant is an idiom used to describe a possession that is useless or troublesome, especially one that is expensive to maintain or difficult to dispose of (a financial burden).
An apple of one's eye means someone dearly loved.

An eyesore means something unpleasant to look at.

A rare bird refers to an exceptional or unique person or thing.