The . . . . . . . arguments put forth for not disclosing the facts did not impress anybody.

The correct answer is B. specious.

A specious argument is one that appears to be true but is actually false. In this case, the arguments put forth for not disclosing the facts were not convincing because they were based on false or misleading information.

The other options are not correct because:

• A convincing argument is one that is persuasive and makes sense.
• A spurious argument is one that is based on false or misleading information.
• An intemperate argument is one that is angry or uncontrolled.