Select the most appropriate option to fill in the blank and make a grammatically correct sentence.

The blind man needed ____ to cross the street.

assistance

The most appropriate option to fill in the blank is assistance.

The sentence is about how the blind man needed assistance to cross the street. The word "assistance" means "help or support." This is the most appropriate word because it accurately describes what the blind man needed.

The other options are not as appropriate.

• Guards are people who protect something or someone. This does not make sense in the context of the sentence, because the blind man did not need to be protected, he needed help crossing the street.
• Cooperation is the willingness to work together. This does not make sense in the context of the sentence, because the blind man did not need the cooperation of others to cross the street, he just needed their help.
• Porters are people who carry luggage. This does not make sense in the context of the sentence, because the blind man did not need someone to carry his luggage, he just needed help crossing the street.