Answer:
top center ≈ 0.88
bottom right ≈ 0.48
Step-by-step explanation:
The two right-most graphs look about the same, yet you have assigned wildly different correlation values. The both seem to be in the neighborhood of 1/2. (I agree that the upper right appears to be about -1/2.)
The top-center graph is much more correlated than the one to its right. It computes to be about 0.88.
Your other choices seem about right. (Lower left computes as -0.87.)
