Sentences expressing a wish or condition that cannot be real or factual are written in which version mood?

D) Subjunctive.

Explanation:

Verb moods are classifications that indicate the attitude of the speaker. Verbs have four moods: indicative, imperative, conditional and subjunctive. The indicative mood is used in statements and affirmations, the imperative mood is used in in requests and commands, the conditional mood is used to express propositions whose validity is dependent on some condition and the subjunctive mood is used  to express hypothetical situations, also wishes, desires or things that aren't factual.

The answer is a Complex sentence

Explanation:

Complex sentence is the type of sentence whereby there is atleast an independent clause and one or more dependent clause. since the independent clause can stand alone on its own, it makes it easer to separate from a dependent clause.

From the statement given above, The weather forecast has predicted severe thunderstoms is an independent clause which stood on its own. The dependent clause, the dark, heavy thunderclouds never materialzed is being linked together with an independent clause by a linking work but.