7   4   8   2 = 24

Let us check all the options one-by-one.
From option (a),
7 - 4 x 8 x 2 = 24 (using VBODMAS rule)
? 7 - 64 = 24 ? -57 = 24
? LHS ? RHS ? RHS
So, option (a) is incorrect.

From option (b),
7 - 4 x 8 ÷ 2 = 24 (using VBODMAS rule)
? 7 - 4 x 8 ÷ 2 = 24 (using VBODMAS rule)
? 7 - 4 x 4 = 24 ? 7 - 16 = 24
? -9 = 24 ? LHS ? RHS
So, option (b) is incorrect .
From option (c),
7 x 4 - 8 ÷ 2 = 24 (using VBODMAS rule)
? 7 x 4 - 4 = 24 ? 28 - 4 = 24
? 24 = 24 ? LHS = RHS
So, option (c) is correct and hence, there is no need to check option (d).