Final answer:
The best type of study to determine the effects of daily reading with a parent on a child's independent reading speed is a controlled experiment.
Step-by-step explanation:
The best type of study to determine if daily reading with a parent can increase the speed at which a child learns to read independently is A. a controlled experiment. In a controlled experiment, researchers could assign one group of children to have daily reading sessions with a parent, while another group does not. By comparing the reading progress of the two groups, researchers can determine if there is a causal relationship between reading with a parent and increased reading speed.