Negative correlation is seen when the dependent variable decreases as the independent variable increases, while positive correlation is when they increase together.
Plots c and d are negative and c is more organised so corresponds to the value closer to -1, that is, -0.923. d is less organised so corresponds to -0.456.
Plot a is non-linear so, assuming an intended linear correlation, a must be close to zero, that is, 0.008.
Plot b corresponds to 0.798.