There are two kinds of correlation
1. Positive Correlation
2. Negative Correlation
As all the values of r(Correlation Coefficient)given in the table{A. 0.55 B. 0.45 C. 0.65 D. 0.75} are positive, so higher the value of r Strongest the correlation.
The Highest value of r is 0.75 .
The two values of r which describes strongest correlation is (+1) and (-1) and the linear relationship which describes weakest correlation having value r, has value 0.
Option (D) 0.75 is true option.