Interactive Elements, HTML5

Question: 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 ______ element to add word break opportunities.
A
<video>

B
<track>

C
<summary>

D
<wbr>

Note: "wbr" means "Word Break Opportunity". The "wbr" tag specifies where in a text it would be ok to add a line-break.
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Question: 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 ______ element to add word break opportunities.