Select the option that can be used as a one-word substitute for the given group of words.

Unable to speak distinctly or express oneself clearly

Inarticulate

The correct answer is inarticulate. The other options do not accurately describe the meaning of the given group of words.

• Inane: lacking sense or meaning; silly.
• Inapt: not suitable or appropriate.
• Inarch: to bend or curve inward.

Inarticulate, on the other hand, means unable to speak distinctly or express oneself clearly. It is a term that is often used to describe people who are unable to speak due to a physical or mental condition, but it can also be used to describe people who are simply not very good at expressing themselves verbally.