Choose the option that is the passive form of the sentence.

The first settlers displaced the original inhabitants.

The original inhabitants were displaced by the first settlers.

The correct option that is the passive form of the sentence is The original inhabitants were displaced by the first settlers.

The other options are incorrect because:

• The original inhabitants will displace the first settlers is in the future tense, while the original sentence is in the past tense.
• The original inhabitants are displacing the first settlers is in the present progressive tense, while the original sentence is in the past tense.
• The original inhabitants are being displace by the first settlers is grammatically incorrect. The preposition "by" should be followed by a noun or a pronoun, but the phrase "being displace" is not a noun or a pronoun.