Answer :
You forgot to tell us what the underlined word is, as when you copy pasted the questions, it removed the formatting.
However a concrete noun is identifiable by the 5 senses.
Taste/Touch/Sight/Hearing/Smell
EDIT: After having an update, the answer is A, looked.
However a concrete noun is identifiable by the 5 senses.
Taste/Touch/Sight/Hearing/Smell
EDIT: After having an update, the answer is A, looked.
looked because it is possible for looked as in looked forward to to be a concrete noun