Question

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Answer 1

I think its a. And c. Because concrete nouns are things that you can ,see hear ,taste ,smell. You can see dogs and walls. For Monica and Steve, I'm not sure of those 2 because there can be people named that but not sure.

Answer 2

Hey there!

A concrete noun is something people can see, touch, or basically use sense with.

Dog - This answer should be correct because you can use your senses with a dog. You can touch a dog with your hands and use your sense of touch.

Steve - This is a proper noun because this is a name of a person.

Wall - This is a common noun because it is just a thing/object.

Monica - This will also be a proper noun because it is someone's name.

Your final answer will be option A.
"Dog" is the concrete noun.

Hope this helps you.
Have a great day!