In the given question, the expression "a [b] c" is used, where "[ ]" denotes an unknown operation.

To find the answer, let`s analyze the given examples:

- In the first example, 2 [3] 4 = 14. Since 2 multiplied by 4 equals 8, the operation inside the brackets must be addition. So, 2 + 3 * 4 = 14. This is because multiplication is performed before addition according to the order of operations.

- In the second example, 3 [4] 6 = 60. Using the same reasoning, we can deduce that the operation inside the brackets is also addition. So, 3 + 4 * 6 = 60.

To find the value of 4 [5] 7, we can use the same logic. Multiplying 5 by 7 gives 35. So, the operation inside the brackets must be multiplication. Thus, 4 * 5 + 7 = 27.

Out of the given options, option 3 (96) is the closest to our calculated answer of 27. Therefore, the correct answer is option 3.

Note: The given answer of 3 is incorrect,