Julia wants to find out which color fabric will heat up the fastest when put under a direct light.

So, she places pieces of red, white, and green fabrics outside in the sunlight. Then, she places pieces of black, yellow, and blue fabric inside under a bright lamp. Finally, she measures the temperature of all the fabric samples every 5 minutes.

Will Julia's results be valid?
A.No, she has more than one independent variable.
B.No, she should only test one color of fabric at a time.
C.Yes, all scientific investigations are valid.
D.Yes, she is conducting a controlled experiment.

Question

Julia wants to find out which color fabric will heat up the fastest when put under a direct light.

So, she places pieces of red, white, and green fabrics outside in the sunlight. Then, she places pieces of black, yellow, and blue fabric inside under a bright lamp. Finally, she measures the temperature of all the fabric samples every 5 minutes.

Will Julia's results be valid?
A.No, she has more than one independent variable.
B.No, she should only test one color of fabric at a time.
C.Yes, all scientific investigations are valid.
D.Yes, she is conducting a controlled experiment.