Respuesta :
The answer is 'A crowd drawn by a skateboarder doing flip tricks' because it doesn't have a predicate. That statement itself is a complete subject.
Answer: A crowd drawn by a skateboarder doing flip tricks.
Explanation: All other options are complete sentences because they have a subject and a predicate, whereas in this phrase, the verb words "drawn" and "doing" are only participles (past and present, respectively) introducing participle phrases that describe the nouns "crowd" and "skateboarder." The whole fragment is just a complex noun phrase that could take the role of a subject or an object in a sentence.