JEE Main Chemistry question

An aqueous solution of hydrogen sulphide shows the equilibrium, H₂S ⇌ H⁺ + HS⁻. If dilute hydrochloric acid is added to an aqueous solution of hydrogen sulphide without any change in temperature, then:

• (A)The equilibrium constant will change
• (B)The concentration of HS⁻ will increase
• (C)The concentration of undissociated hydrogen sulphide will decrease
• (D)The concentration of HS⁻ will decreaseCorrect