Answer:
{In Explanation}
Explanation:
The broadcast media influences public opinion in the US by being biased, not reporting all of the news but only reporting what they want the public to know, and by reporting false news. The entertainment media influences public opinion because too many people believe that what they see on television or in the movies is real.
An adjective clause functions as an adjective, that is, it gives some information about a noun in a sentence (or a pronoun) ( information which is not an action).
The noun modified here is "knife" and the information about the knife, that is the complete adjective clause is "<span> that his dad gave him.
"</span>
The most common way to start a sentence is with a subject, making the correct answer B.
An example would be a simple sentence "He broke the window" where "he" is the subject.