a) <a>
b) <p>
c) <li>
d) <ol>

Answer: a
Explanation: <a> element is used for creating links. We can click anything written between opening <a> tag and closing </a> tag. E.g., <a href= “http://www.gmail.com”> GMAIL </a>. The text written between <a> and </a> is called link text. <p></p> defines paragraph. <li> specifies list of item. <ol> is ordered list which can be either numerically or alphabetically.