The answer is d. This sentence helps you separate the actual warning and the word "warning" by using a colon. The other sentences don't make sense because they don't have that.
Answer:
infinitive: to search
Infinitive phrase: to search for the girl
Explanation:
Palms are sweaty, knees feel weak, arms are heavy. Theyre might be vomiting so watch your sweater and keep clear of mom's spaghetti
