What does presumptuous mean?

The term "presumptuous" describes someone who is excessively bold or rude, often overstepping social boundaries or taking liberties that they haven't earned. This behavior can manifest in assuming too much about what is acceptable in a given situation or making unwarranted assumptions about others.

The other options do not capture this meaning effectively. While "modestly restrained" suggests an opposite approach to behavior, "thoughtful and considerate" implies a kind-heartedness that is contrary to the self-serving nature of being presumptuous. "Highly optimistic" relates to having a positive outlook, which does not convey the idea of overstepping boundaries or being insolent. Therefore, the choice that accurately reflects the meaning of "presumptuous" is being excessively bold or rude.