Topic: Subject Verb Agreement,

Best Answer Explained in Below-:

The phrase "Many a flower — born to blush unseen" employs a literary idiom where the singular form is used to convey a collective meaning. In this construction, "many a" is followed by a singular noun ("flower"), which creates an emphasis on individual instances within a larger context. The choice of the verb "is" fits seamlessly grammatically and contextually here because it denotes a state of being currently applicable to the flowers.

Using “is” instead of other verb forms like "are," "were," or "was," preserves the timeless and universal quality of the statement. "Is" suggests that the flowers' fate—to bloom unnoticed—is a perennial truth. In contrast, "were" implies a past condition that may no longer be relevant, while "was" would incorrectly suggest one specific flower rather than the collective notion implied by "many a." Finally, "are" would incorrectly pluralize the concept and disrupt the idiom's intended meaning. Thus, "is" remains the accurate choice, allowing the sentiment of beauty and unnoticed existence to resonate universally.