The correct option is B The horse has hurt itself.
The basic order of words in a sentence is: subject + verb + object.
A sentence may not contain an object, depending on the verb. Transitive verbs like 'appear', 'die', etc do not require objects.
To
this basic structure, different elements can be added. For example,
noun phrases, adjective phrases, subject complements, types of clauses
and so on.
Option C: The structure in this sentence complies with the basic structure:
subject (The horse) + auxiliary verb (has) + main verb (hurt) + object (itself).
Hence C is the correct option.
Option A: It's a jumble of words which do not make a meaningful sentence.
Option B: The sentence does not follow the required order. The incorrect order that it follows is: object + auxiliary + subject + main verb.
Option D: Similarly, here, too, the sentence does not follow the required order.
Hence options A, B and D are incorrect.