Select the most appropriate word to fill in the blank and make a meaningful sentence.

The two friends were too ________ to admit that they were wrong.

stubborn

The most appropriate word to fill in the blank is stubborn.

The word "stubborn" means to be unyielding or inflexible in one's opinions or beliefs. This is the most appropriate word because it accurately describes how the two friends were behaving. They were unwilling to admit that they were wrong, even though they knew that they were.

The other options are not as appropriate.

• Satisfied means content or pleased. It does not make sense in the context of the sentence, because the two friends were not content or pleased with being wrong.
• Voluntary means done or undertaken of one's own free will. It does not make sense in the context of the sentence, because the two friends were not doing anything of their own free will.
• Reasonable means fair or sensible. It does not make sense in the context of the sentence, because the two friends were not being fair or sensible by refusing to admit that they were wrong.