Final answer:
The direct object in a sentence is the noun or pronoun that receives the action of the verb. In these sentences, the direct objects are 'the fence', 'it', 'the ranch', and 'the bear'.
Step-by-step explanation:
In the sentence "Mama will fix the fence", the direct object is the fence (option c). The direct object is the noun or pronoun that receives the action of the verb. In this case, the verb is "fix" and the fence is being fixed by Mama.
In the sentence "Their hired man saw it", the direct object is it (option c). The direct object is the noun or pronoun that receives the action of the verb. In this case, the verb is "saw" and "it" is what is seen by the hired man.
In the sentence "Our parents warned us to stay on the ranch", the direct object is the ranch (option d). The direct object is the noun or pronoun that receives the action of the verb. In this case, the verb is "warned" and the ranch is where we are being warned to stay on.
In the sentence "I will never forget the bear we met in the woods", the direct object is the bear (option c). The direct object is the noun or pronoun that receives the action of the verb. In this case, the verb is "forget" and the bear is what I will never forget.