Final answer:
Resume infant CPR after AED shock using the two thumb-encircling hands technique with a ratio of 15 compressions to 2 breaths. The correct option is c.
Step-by-step explanation:
After delivering one shock with an AED, you and your partner should immediately resume CPR on an infant using the two thumb-encircling hands technique. The correct ratio of compressions to breaths is 15 compressions to 2 breaths. This technique involves encircling the infant's chest with both hands while the thumbs perform the compressions at a depth appropriate for an infant's size and at the standard rate of at least 100 compressions per minute.
Hence, c is the correct option.