Which correlation represents the strongest correlation

If you have a difficult time knowing where your hand is without looking at it you may be having a problem with your what ?

The vaccine in a flu shot contains weakened flu viruses. how does a flu shot work with the immune system? a. it destroys lymphocytes. b. it destroys macrophages. c. it activates macrophages. d. it activates lymphocytes.

Consider the venn diagram of plant reproduction. where in this image, areas a - d, would you insert the picture of the orange lily?