Which of the Following Is(are) NOT Trend(s) of Vertebrate Evolution

Which of the following is(are) NOT trend(s) of vertebrate evolution?

A) conversion of the support for locomotion from the notochord to the vertebral column
B) expansion of the nerve cord to form the brain and spinal cord
C) changes in the respiratory system from gills to lungs with accompanying changes in the circulatory system
D) the development of fewer, more efficient chambers in the heart
E) modification of limbs that allowed for more efficient movement