The Mexican Congress Has Evolved from a Rubber-Stamp Institution to One

The Mexican Congress has evolved from a rubber-stamp institution to one that must be negotiated with the executive branch due to

A) rulings by the Mexican Supreme Court upholding Congress's role in the policy process.
B) the passage of constitutional amendments that strengthened the role of the Mexican Congress .
C) the loss by the Institutional Revolutionary Party (PRI) of its stranglehold on congressional representation.
D) the growth of a recalcitrant public demanding more representation in the policy-making process.
E) changes in the policy implementation process, which   made the process less flexible.