Select the word or phrase that best completes the following sentence:-

Desert flowers can be invisible for years _____ appear suddenly after heavy rain.

actually, but

The correct answer is Option (4) → actually, but

Desert flowers can be invisible for years actually, but appear suddenly after heavy rain.

• Invisible for years creates a sense of expectation or typical condition.

• Appear suddenly after heavy rain introduces a contrast and a surprising event.

• The conjunction but is necessary to signal this contrast between the flowers being absent/invisible and then suddenly appearing.

• The adverb actually emphasizes the surprising or factual nature of the sudden appearance, making the contrast stronger and the entire phrase flow naturally.