Final answer:
Waldensians and Cathars were part of the twelfth and thirteenth-century lay piety movement within the Catholic Church. Franciscans and Dominicans were also contributors to this religious revival. Hence, neither Waldensians nor Cathars were groups that did not contribute to the explosion of piety. Therefore correct option is E
Step-by-step explanation:
The burst of lay piety in the Catholic Church during the twelfth and thirteenth centuries included the emergence of various religious groups. Among the options presented, Waldensians and Cathars were indeed a part of this lay piety explosion. However, the Franciscans and Dominicans were also significant contributors to this spiritual revival. Both the Franciscans, founded by St. Francis of Assisi, and the Dominicans, founded by St. Dominic, aimed to return to the basics of Christian life and preach against heresy, making them an integral part of this movement. Therefore, the correct answer is 'E. A & B were NOT', as both Waldensians and Cathars, being considered heretical by the orthodox Church, were not aligned with its renewal efforts during this period.