Your file is not an XML file.
<text>
<questiontext>Keyboard is an input or output device?</questiontext>
</text>
<Option answer="true">
<questionoption>input</questionoption>
</Option>
<Option answer="false">
<questionoption>output</questionoption>
</Option>
<Option answer="false">
<questionoption>both</questionoption>
</Option>
<Option answer="false">
<questionoption>none</questionoption>
</Option>
Just a part of the corrections to make your file an XML.