Passage

The proposal is promising, but its cost estimates are optimistic and its timeline leaves several practical questions unanswered.

Question

Which word best describes the author's tone?

Answer

Cautiously critical.

Solution

1. The author acknowledges that the proposal is promising.
2. However, the words 'optimistic' and 'unanswered' raise concerns.
3. The tone is critical but not wholly dismissive, so cautiously critical fits.