Select the answer that shows the verb or verbs in this sentence: Industry-wide focus and investment of energy and resources on protocol design optimization are in part a function of the keen interest among sponsor companies in identifying sustainable opportunities to lower project costs and improve cycle time amidst a challenging global operating environment. Select one: a. are b. focus investment optimization are interest identifying lower improve challenging operating c. investment are identifying lower d. investment design function interest identifying lower improve challenging operating e. investing optimizing parting functioning interesting sustaining lowering improving challenging operating