A.
B is wrong since water is not soluble in lipids
Anticodons are a part of transfer RNA(tRNA) molecules, and corresponds to a codon on a messenger RNA(mRNA) molecule.
Your answer is A, anticodon; codon.
The correct answer would be a positive feedback loop. when contractions happens its to help get the baby out and to let you know when the baby is coming so when the contractions start it means you are going into labor.