please answer these question ASAP Just tell correct option

QUESTION 12 The figures show standing waves of sound in six organ pipes of the same length. Each pipe has one end open and the other end closed. More: some of the figures show situations that are not possible. XX XXX Which one of the pipes emits sound with the lowest frequency? DA4 OB OCE OD.1 DE.S QUESTION 13 figures show standing waves of sound in six organ pipes of the seme length. Each pip some of the figures show situa tions that are nor possible. XXX ference Mel 17- Which one of the pipes emits sound with the highest frequency? DA4 OB.6 OC D D.3 DE2 QUESTION 14 The figures show standing waves of sound in six organ pipes of the same length. Each pipe has one end open and the other end closed. Note: some of the figures show situations that are not possible. XXXX (5) Reference Ref 17-6 Which one of the pipes is resonating in its third harmonic? OA3 O B.6 O C.4 OD1