Fehling’s solution ‘A’ is

The correct option is aqueous copper sulphate.

Fehling's reagent is a widely used chemical reagent to differentiate between water-soluble carbohydrate and ketone functional groups, and as a sensitive test for reducing sugars. The reagent is typically prepared fresh in the laboratory by mixing two separate solutions:
1. Fehling’s solution A: An aqueous solution of copper(II) sulphate, which provides the copper(II) ions (${\mathrm{Cu}}^{2+}$) and gives the solution its characteristic deep blue color.
2. Fehling’s solution B: An alkaline solution of sodium potassium tartrate (also known as Rochelle salt) dissolved in sodium hydroxide ($\mathrm{NaOH}$). The tartrate ions act as a chelating agent to keep the copper(II) ions in solution under alkaline conditions, preventing the precipitation of copper(II) hydroxide.

Therefore, Fehling’s solution 'A' specifically refers to the aqueous copper sulphate solution.