Option 1 -> Destructive means causing harm or damage, which is unrelated to timing or favorability.
Option 2 -> Thoughtful means showing careful consideration, but doesn't capture the time-related aspect of opportune.
Option 3 -> Timely means occurring at a favorable or appropriate time, which directly matches the meaning of opportune.
Option 4 -> Charitable means generous or kind-hearted, which has no connection to timing or appropriateness.
Hence, Option 3: Timely -> Opportune specifically refers to something happening at the right moment or favorable time, making "timely" the perfect synonym as both words emphasize appropriateness of timing -> correct