Answer=B
The explanatory variable is another term for the independent variable. The independent variable is the 'thing' that YOU decide to change/manipulate in an experiment. The type of nail polish given was the independent variable for this experiment.
One pizza serves four people so, you will need 10 pizzas for 40 people so that make the answer (A.)
8.54. The last number is low so it can not round up to 5
