Which code segment should you inser at line 03?

You use Microsoft Visual Studio 2010 and Microsoft .NET Framework 4.0 to create an application.
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 localization features to the application. You add the following code segment.
(Line numbers are included for reference only.)

01 public IEnumerable <XNode> GetTextNodesForLocalization(XDocument doc)
02 {
03 …
04 return from n in nodes
05 where n.NodeType = XmlNodeType.Text
06 select n;
07 }

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 line 03?

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