General Studies · Analogy

Following a certain logic, 14 is related to 47. Following the same logic, 23 is related to 74. Following the same logic, 42 is related to which of the following options? (Note: Operations must be performed on whole numbers, without breaking them into their component digits. Take 13 for example - operations on 13, such as addition/subtraction/multiplication by 13, etc., can be performed. Breaking 13 into 1 and 3 and then performing mathematical operations on 1 and 3 is not allowed.)