Final answer:
A Dirty Brown Sugar Milk Latte with pearl (L) is made by brewing espresso, adding brown sugar, milk, pearls, and adjusting ice levels according to preference like 70% sweetness and 30% ice or other combinations provided.
Step-by-step explanation:
Preparing a Dirty Brown Sugar Milk Latte with pearl involves several steps and choosing the right levels of sweetness and ice according to the customer's preference. When we look at the options provided, options a) 70% sweetness, 30% ice, b) 50% sweetness, 100% ice, c) 100% sweetness, 0% ice, and d) 0% sweetness, 50% ice, the preparation process would begin with brewing the espresso, then adding brown sugar for sweetness, followed by the desired amount of milk, pearls (tapioca balls), and finally, adjusting the ice to the preferred level.