A
Extensor carpi radialis brevis and Extensor digitorum communis
B
Extensor pollicis longus and Extensor carpi ulnaris
C
Extensor pollicis longus and Extensor digitorum communis
D
Extensor digiti minimi and Extensor carpi ulnaris
Explanation:Correct Option: C. The 3-4 portal is the standard primary viewing portal in wrist arthroscopy. It is palpated just distal to Lister's tubercle, located safely between the 3rd extensor compartment (containing the extensor pollicis longus, EPL) and the 4th extensor compartment (containing the extensor digitorum communis, EDC). (Ref: Chen et al., Arthroscopy, 1988)