Solution:The pattern followed here is :(a, b, c) → [{(a + c) ÷ 2} - 4] = b
(38, 172, 314) → [{(38 + 314) ÷ 2) - 4] ⇒ {(352 ÷ 2) - 4} ⇒ 176 - 4 = 172
(42, 176, 318) → [{(42 + 318) ÷ 2} - 4] ⇒ {(360 ÷ 2) - 4} ⇒ 180 - 4 = 176
Similarly,
(18, 152, 294) → [{(18 + 294) ÷ 2} - 4] ⇒ {(312 ÷ 2) - 4} ⇒ 156 - 4 = 152
Hence, "(18, 152, 294)" is the correct answer.