Concept:The word "forecast" means to state what is likely to happen in the future based on available information or study.
Explanation:In the sentence, "It was forecast that there would be thunderstorm in the evening," the speaker is reporting what weather experts expected.
A forecast is not a past observation or a simple calculation.
It is a statement about a future event, especially weather.
The word "predicted" fits this meaning perfectly.
Weather forecasters predict conditions such as rain, storms, or sunshine.
Among the options, "broadcast" refers to sending out a message, which is not the same.
"Calculated" means worked out using numbers, and "observed" means seen or noticed directly.
Only "predicted" matches the future-looking meaning of "forecast."
Therefore, the best replacement in this sentence is "predicted."
Answer:D. predicted