【单选题】The following structures and events serve to strengthen the walls of the inguinal canal except
A.
The inguinal ligament is made tense by extending the hip joint.
B.
The contracting internal oblique muscle reinforces the anterior wall of the canal in front of the weak deep inguinal ring.
C.
The strong conjoint tendon reinforces the posterior wall of the canal behind the weak superficial inguinal ring.
D.
Contraction of the arching fibers of the internal oblique and transversus abdominis muscles lowers the roof of the canal so that the canal is practically obliterated.
E.
After birth, as the result of growth, the deep inguinal ring moves laterally away from the superficial ring so that the canal becomes oblique and the two rings no longer lie opposite one another.