Which of the following statements is correct?

a. The current interest in the manipulation of microbes, plants and animals has raised serious ethical issues.
b. One possible risk of genetic engineering is the accidental production of dangerously resistant microorganisms.
c. Although risks are possible, genetic engineering appears to offer more of contribution to human welfare than threats.

• A

  a only

• B

  c only

• C

  b only

• D

  a, b and c