The correct option is A 1>2>3
The presence of −OH groups in a compound leads to Hydrogen-bonding which greatly increases its boiling. Generally, the more 'exposed' the −OH group, the better it can participate in intermolecular H-bonding and thus, the boiling point will elevate. By that logic, primary alcohols will have the highest boiling point while tertiary alcohols will have the lowest boiling point.
1°>2°>3°
Hence, Option A is correct.