Item A - The <wbr> (Word Break Opportunity) tag specifies where in a text it would be ok to add a line-break.Tip:When a word is too long, or you are afraid that the browser will break your lines at the wrong place, you can use the <wbr> element to add word break opportunities.
Item B - The <datalist> tag specifies a list of pre-defined options for an <input> element.
The <datalist> tag is used to provide an "autocomplete" feature on <input> elements. Users will see a drop-down list of pre-defined options as they input data.
Item C -OK
Item D - The <summary> tag defines a visible heading for the <details> element. The heading can be clicked to view/hide the details. http://www.w3schools.com/tags/tryit.asp?filename=tryhtml5_summaryItem E - The <track> tag specifies text tracks for media elements (<audio> and <video>).This element is used to specify subtitles, caption files or other files containing text, that should be visible when the media is playing.