For the first unit of the variable input, which one of the following is true?

MP and AP are the same

The correct answer is Option 1: MP and AP are the same

MP is the output from one additional unit of variable unit. So, when first unit of variable input (say, labour) is employed, the output produced is MP itself. And AP is the total product divided by the number of units of variable input. For the first unit, the output produced is nothing but TP and dividing that TP by number of units of variable input (that is, 1) we get TP only. And for the first unit TP and MP are the same as MP is the change in TP