Answer:
D.
Explanation:
A formal speech is the one that is given without using visual aids. These speech aims to impart knowledge to the audience, to entertain, etc.
While delivering a formal speech, the most effective way to grab the initial attention of the audience is to look directly at the audience without saying a word.
By doing so, the speaker gives an impression of his confidence and through eye contact tries to ask for the attention of his/ her audience.
So, the correct answer is option D.