What Is the Purpose of Submitting an Amicus Curiae Brief

What is the purpose of submitting an amicus curiae brief ?

A) Amicus curiae briefs are written to show support for the lower court's ruling.
B) Amicus curiae briefs allow interest groups and other organizations to convey their opinions to the justices of the Supreme Court.
C) Amicus curiae briefs designate that the federal government has an interest in the outcome of the case.
D) Amicus curiae briefs are often written anonymously and then leaked to the press in an effort to influence public opinion.