For an oral interpretation, it is the responsibility to create an appropriate atmosphere, mood, and background.
a. author’s
c. audience’s
b. speaker’s
d. host’s

For an oral interpretation, it is the (B speaker's) responsibility to create an appropriate atmosphere, mood and background.

The speaker must ensure that an appropriate atmosphere is being set and that can be through direct and indirect language, ie body language.

the meaning of the word broods in verb form is a family of animals used in section 2