The correct passive form of the given sentence is:

☀ We were surprised by the news.

Now let's analyze the other options:

☀ We had been surprised at the news. This passive form is incorrect because it uses the past perfect continuous tense ("had been surprised"), which is not appropriate for this sentence. The simple past tense "were surprised" is more suitable.

☀ We had being surprised by the news. This passive form is incorrect. "Being" is not needed here, and the correct form is "were surprised" (simple past tense).

☀ We had surprised by the news. This sentence is in the active voice, not the passive voice. "We had surprised" means that "we" caused the surprise, but the original sentence is about the news surprising "us."