The correct answer is: D. Neither I nor II follows
The first statement is “All pens are chalks.” This means that every pen is a chalk. The second statement is “All chairs are chalks.” This means that every chair is a chalk.
The first conclusion is “Some pens are chairs.” This means that there exists at least one pen that is also a chair. However, this conclusion does not follow from the premises. The premises only say that every pen is a chalk and that every chair is a chalk. They do not say anything about whether or not there exist pens that are also chairs.
The second conclusion is “Some chalks are pens.” This means that there exists at least one chalk that is also a pen. However, this conclusion also does not follow from the premises. The premises only say that every pen is a chalk and that every chair is a chalk. They do not say anything about whether or not there exist chalks that are also pens.
Therefore, neither conclusion I nor conclusion II follows from the premises.