On examination of an 8 years-old child you find 75 with carious exposure. On X-ray you find 35 missing. Your treatment is:
A. Extraction of 75 allowing 36 to move mesially
B. Pulpotomy on 75 and wait indefinitely
C. Extraction of 75 and place a fixed space retainer to be replaced with fixed bridge. D. Extraction of 65 and 75