عشان يكون تقيمي مفيد للمتيريال اللي عندي ضروري اعرف شلون راح يستخدم

To achieve a good evaluation of a material, …………

a-You have to think of the cost
b-You have to think of how the material will be used
c-You have to think of how appealing it is
d-You have to think of the factor of time