The anticodon transfer RNA for the messenger RNA codon GCA is-

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Hint: RNA, the ribonucleic acid short form, a high molecular weight complex compound which operates in synthesis of cell protein and substitutes for DNA (deoxyribonucleic acid) in a series of viruses as a carrier of genetic codes.

Complete answer:
RNA forms of phosphodiester bonds, containing chains of various lengths of ribose nucleotide (Nitrogenous bases appended to ribose sugar). Adenine, guanine, cytosine and uracil are the nitrogen bases in the RNA, combining thymine with DNA. RNA ribose sugar consists of five carbons and one oxygen, which are cyclically arranged. In the ribose sugar molecule RNA is vulnerable to hydrolysis owing to the presence of a chemically reactive hydroxylated form (−OH) in the second carbon region. This chemical lability of RNA is considered one of the reasons why DNA has grown to be the favoured carrier of genetic information in most species in contrast to DNA, which has a reactive −OH class in the same place on the sugar movement (deoxyribose). R.W. Holley identified the composition of the RNA molecule in 1965.
Messenger RNA bases are similar to DNA strand bases. Again, on RNA, one of these adnine (A) of DNA occurs, the uracil (U) base opposite guanine (G) is cytosine (C). Therefore, CGU will be the GCA anticodon.
A long chain of monomer nucleotides helps in the making of each strand of a DNA molecule. The DNA nucleotides consist of a sucrose deoxyribose, with phosphate in a ring and a base of four: two purines (adenine and guanine) and two pyrimidines (cytosine and thymine). The covalent links between one nucleotide's phosphate and the next sucrose create a backbone of phosphate-sugar from which the nitric bases protrude, mixing these nucleotides. The sequencing is specific — i.e. adenine connections only with thymine, and cytosine only with guanine; a hydrogen bonding is a series of this relation.
Hence, option D in the correct option.

Note: DNA, deoxyribonucleic acid, is an organic chemical complex molecular form present in all prokaryotic cells and in certain viruses. DNA, organic chemistry. For the transmission of inherited characteristics DNA code, the genetic details.