Chemical Reactions and Equations

Three beakers labelled as A, B and C each containing 25 mL of water were taken. A small amount of NaOH, anhydrous
CuSO4 and NaCl were added to the beakers A, B and C respectively. It was observed that there was an increase in
the temperature of the solutions contained in beakers A and B, whereas in case of beaker C, the temperature of the
solution falls. Which one of the following statement(s) is(are) correct?
(i) In beakers A and B, exothermic process has occurred.
(ii) In beakers A and B, endothermic process has occurred.
(iii) In beaker C exothermic process has occurred.
(iv) In beaker C endothermic process has occurred.
(a) (i) only (b) (ii) only (c) (i) and (iv) (d) (ii) and (iii)