Question

Our suitcases are packed and we are ______ ready to go to the airport.

Answer 1

The correct answer is B and here is why

A is wrong because it should not be capitalized
B is right because all the others are wrong :)
C is wrong because the word should not have 2 L's
D is wrong because it should not have a space

Using reasoning is really helpful in questions like these

Answer 2

The answer is the first one