Extract First Element of Sublists

Write a Python function `extract_first_elements` that takes a list of sublists as input and returns a new list containing the first element of each sublist.

#### Example Usage
```python [main.nopy]
print(extract_first_elements([[1, 2], [3, 4, 5], [6, 7, 8, 9]]))  # Output: [1, 3, 6]
print(extract_first_elements([[1, 2, 3], [4, 5]]))  # Output: [1, 4]
print(extract_first_elements([[9, 8, 1], [1, 2]]))  # Output: [9, 1]
```

#### Constraints
- Each sublist will have at least one element.
- The input list will contain at least one sublist.
def extract_first_elements(lst):
    """
    Extract the first element from each sublist in the given list.

    Args:
        lst (list of list): A list containing sublists.

    Returns:
        list: A list containing the first element of each sublist.
    """
    # Write your code here
    pass
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