Identify the segment in the sentence which contains a grammatical error.
Parul is ten years elder than her sibling.

Correct option is C

The correct phrase is "older than or elder to" 'Elder' is traditionally used only for comparison between siblings.
We always prefer to use 'elder to' – that is the correct usage. We can say 'older than' to refer to objects, but elder to – is used to refer to people. Old refers to anything that belongs to the past.