This is a matching question on hormone chemistry. The safest way to solve it is to first classify each named hormone by its chemical nature, then match the letters to the correct class.
Steroid hormones: built from cholesterol, fat soluble, and able to cross the cell membrane directly to act inside the cell. Estrogen and testosterone belong here.
Amine hormones: small molecules built from a single amino acid such as tyrosine or tryptophan. Thyroxine and melatonin fall in this class.
Protein hormones: long chains of many amino acids folded into a working shape. TSH and ACTH are typical protein hormones from the pituitary.
Peptide hormones: short chains of amino acids, smaller than full proteins. ADH and oxytocin are classic peptide hormones.
Matching each labelled hormone in the figure to its correct chemical class in this order gives the pairing A2, B1, C4, D3, since every hormone has exactly one class it belongs to based on its molecular structure.
Let's summarize:
Hormones are grouped by chemical nature into steroid, amine, protein, and peptide types.
Matching each hormone to its class, rather than guessing from the answer choices, gives one checkable pairing.
The pairing that fits every hormone to its correct class is A2, B1, C4, D3, option (2).
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