Which code segment should you inser at the empty line?

The application contains following XML document.
<feed>
<title>Products</title>
<entry>
<title>Entry title 1</title>
<author>Author 1</author>
<content>
<properties>
<description>some description</description>
<notes>some notes</notes>

<comments>some comments</comments>
</properties>
</content>
</entry>
…
</feed>
You plan to add localizationfeatures to the application.
You add the following code segment:
public IEnumerable <XNode> GetTextNodesForLocalization(XDocument doc)
{
— empty line here
return from n in nodes
where n.NodeType = XmlNodeType.Text
select n;
}
You need to ensure that the GetTextNodeForLocalization method returns all the XML text nodes of
the XML document. Which code segment should you inser at the empty line?

A.
IEnumerable <XNode> nodes = doc.Descendants;

B.
IEnumerable <XNode> nodes = doc.Nodes();

C.
IEnumerable <XNode> nodes = doc.DescendantNodes;

D.
IEnumerable <XNode> nodes = doc.NodesAfterSelf;

Explanation:
DescendantNodes() Returns a collection of the descendant nodes for this document or element, in
document order.
Descendants() Returns a collection of the descendant elements for this document or element, in
document order.
Nodes() Returns a collection of the child nodes of this element or document, in document order.
NodesAfterSelf() Returns a collection of the sibling nodes after this node, in document order