An independent clause must contain a
subject
subject and a predicate
predicate
subordinate clause

The answer is B. subject and a predicate

B) Subject and a predicate.

Explanation: an independent clause is a phrase that has complete meaning on its own (it is the antonym of dependent or subordinate clause, which is a phrase that doesn't have complete meaning when it is by itself). An independent clause should always have a subject (the person or thing that performs the action of the verb) and a predicate (that can be just a verb, or also have complements and modifiers). So the correct answer is option B.

the answer is

r ≈5.641

plug in the area of 100 yards into the equation

100=

divide each side by pi

≈ 31.8309=

take the square root of each side to find r

=r

r ≈5.641