Which word in the sentence is a direct object?

"the fabric store sells 3,000 yards of fabric each week."

a.) store
b.) yards
c.) week

The direct object in this sentence is the yard. Thus, the answer is letter B. This follows the transitive verb which is a type of an action verb. From the sentence this transitive verb is "sells". Direct objects can either be noun, pronoun, clause, or phrase. 

In this sentence, hard is the adverb because it is modifying the verb.