Explanation:

- Option 1: Garbhadharana

- This is the very first sanskara, related to conception or the act of invoking a child.

- It marks the beginning of life, and is performed before or at the time of conception.

- Option 2: Vivaha

- This means marriage.

- It is an important sanskara, but not the first one—it's performed much later in life.

- Option 3: Jatakarma

- This is the birth ceremony, performed soon after a child is born.

- It's not the first sanskara, but rather the one at birth.

- Option 4: Upanayana

- This is the sacred thread ceremony (initiation into education).

- Usually for boys, though some traditions include girls.

The correct answer is Option 1: Garbhadharana—it is the first sanskara for every child, including a Hindu girl.