Final answer:
The angels might be jealous of human love due to their desire for the human experience of love, which, as spiritual beings, they may not fully comprehend or attain.
Step-by-step explanation:
The question 'Why would the angels be jealous of their love?' refers to a context where human love might inspire envy in celestial beings. Considering the nature of angelic beings and their traditional representation in literature, art, and theology, angels could be construed as being jealous of human love for a variety of reasons. However, based on the extracts provided, it seems that the emphasis is on the human experience of love which is something angels, as spiritual entities, may not encounter in the same way humans do.
Angelic understanding of human emotions might be limited, causing them to long for the tactile and profoundly emotional bond that humans are capable of forming. This unique form of companionship and connection includes all its intensity, struggles, and joys, which could all be factors inciting angelic envy. Thus, the most fitting choice among the given options is that the angels desire the human experience of love (c), as it seems to align closest with the context of your extract, where angels are reaching 'below the barrier' to understand what is beyond their realm.