Jun$-$jun's Pottery spent PhP$4000$ on a improvement of its kiln last year, in the belief that it would cut energy usage $25\%$ over the old kiln. Jun$-$jun is concerned that the new kiln requires extra labor hours for its operation. He wants to check the energy savings of the new oven, and also to look over other measures of their productivity to see if the change really was beneficial. He has the following data to work with: Last Year This Year Production $($finished units$)40004200$ Clay $($pounds$)50005500$ Labor $($hrs$)350375$ Capital $($PHP$)1500019000$ Energy $($kWh$)30002600$ Which of the following is true? O The capital productivity increased from last year to this year. O The materials productivity increased from last year to this year. O None of the above is true. O The labor productivity increased from last year to this year. O The energy productivity increased from last year to this year.