$*$ has the highest precedence and is left associative. So, $((2*3)*4)...$ is done first.
Options A, C and E are eliminated.
After that, $5*6$ should be done.
B and D comply to that.
Now, $+$ and $-$ have equal priority, so treat them as same symbol: $((2∗3)∗4)<symbol>(5∗6)<symbol>7$
And they both are right associative.
So, treat the right symbol first.
=> Do addition first, then subtraction.
Hence, Option B is correct, and D is incorrect.