please help with math thank you, will give brainliest answer!!!

A
7*(1)(14) = 98 Not the right answer. I have done what is inside the brackets first. (5 - 4) = 1; (5 + 9)= 14; 7 * 1 * 14 = 98 which is not 6
B
7 * [1 * 5] + 9 = 44; 7 * 5 + 9 = 35 + 9 = 44 Also not 6
C
7*[5 - 20 + 9] = - 42; Not 6 as well 7*[14-20] = 7*-6 = - 42
D
7*5 - [20 + 9] = 35 - 29 = 6
Answer D
B - Bracket O - Order D - Division M - Multiplication A - Addition S - Subtraction
The last option (7 * 5) - [(4 * 5) + 9]
In Order so you do the first bracket
7 * 5 = 35
Then in the second bracket, you see (4 * 5) + 9
Bracket before addition so,
4 * 5 = 20 20 + 9 = 29
35 - 29 = 6