Which of the following is true about correlation statistics?

Which of the following is true about correlation statistics?
 
  a. A negative correlation is always undesirable.
  b. A strong positive correlation is always desirable.
  c. A weak correlation in one study might be more desirable than a strong correlation in another study if the two studies differ with regard to what variables are being correlated.
  d. A strong correlation is always more desirable than a weak correlation,

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The greater the multicollinearity among the independent variables, the less distortion in the multiple regression findings.
 
  Indicate whether the statement is true or false

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Which of the following is true about correlation statistics?
 
  a. A negative correlation of -.50 is weaker than a positive correlation +.30
  b. A positive correlation of +.50 is stronger than a negative correlation -.50
  c. A negative correlation of -.30 is stronger than a positive correlation of +.25
  d. A negative correlation of -.30 is stronger than a positive correlation +.30