Answer:
Option A
432
Step-by-step explanation:
Let's say when you have only 6 sandwiches and 4 salads, there are 24 different options that you can choose from as shown
Salad 1 Salad 2 Salad 3 Salad 4
Sandwich 1 1 2 3 4
Sandwich 2 5 6 7 8
Sandwich 3 9 10 11 12
Sandwich 4 13 14 15 16
Sandwich 5 17 18 19 20
Sandwich 6 21 22 23 24
You'll realize that this is just multiplication of 6*4=24
Therefore, the same way we multiply 6*4*6*6*3=432 different meals possible