Final answer:
The tRNA with an anticodon of 5'GGC3' pairs with the mRNA codon 3'CCG5', which encodes for the amino acid proline.
Step-by-step explanation:
If a tRNA's anticodon is 5'GGC3', it will pair with the mRNA codon 3'CCG5' according to the base pairing rules where G pairs with C. We can deduce that the amino acid attached to this tRNA would be the one that corresponds to the codon CCG. From the genetic code, we know that the codon CCG specifies the amino acid proline. Therefore, the answer is 4) Proline.