Find out that word, the spelling of which is wrong.

The correct answer is D. Implausible. The correct spelling is “implausible”.

• Impregnable means not able to be conquered or captured.
• Imposter means someone who pretends to be someone they are not, especially in order to deceive others.
• Improbable means unlikely to happen.
• Plausible means seeming likely or reasonable.

The word “implausible” is misspelled because it has an extra “s”. The correct spelling is “implausible”.