Manuel did a science fair project on seed germination.
Here is the procedure:

Step 1: Place equal amounts of moist soil
into two 1-gallon glass jars, and plant
10 radish seeds in each jar.

Step 2: Cover both jars.

Step 3: Place one jar in the refrigerator
Place the other jar in a dark closet.

Step 4: Observe both jars at the same time every day. Record any differences observed in the germination of the seeds.

What was the purpose of Manuel's
project?

A. to determine whether moisture affects
germination

B. to determine whether seeds need
oxygen for germination

C. to determine whether temperature
affects germination

D. to determine how long it takes different types of seeds to germinate

Please answer A,B,C or D.