The correct option is B optimistic
Sanguine means optimistic or positive, especially in an apparently bad or difficult situation. Hence, Option A is correct. Among the rest of the options, anxious means feeling or showing worry, nervousness, depressed means (of a person) in a state of unhappiness or despondency, pessimistic means tending to see the worst aspect of things or believe that the worst will happen. These options do not express the intended meaning, hence incorrect.