Answer:
D.) Buckled and cracked
Step-by-step explanation:
A sentence is a construction expressing a complete thought and containing a subject (the thing or person being dealt with) and a predicate, which is the part of the sentence stating something about the subject and that, at minimum, has a verb.
Therefore, since a sentence must have at least a subject and a verb, if we add a subject to the verbs “blucked and cracked,” we would make a complete sentence.