Step 1: Understanding the Question:
Puberty in girls follows a fairly fixed order of body changes, and the question asks which change shows up first.
Step 2: Key Formula or Approach:
The usual sequence of puberty in girls is thelarche (breast budding), followed by pubarche (pubic and axillary hair), then a growth spurt, and finally menarche (the first period), which comes last of the major milestones.
Step 3: Detailed Explanation:
Menarche is actually one of the last events of puberty, arriving after the breast and hair changes and after most of the height growth spurt has already happened, so it cannot be the first sign.
Pubic hair growth (pubarche) usually starts around the same time as or shortly after breast budding, driven by rising adrenal and ovarian androgens, but it typically follows rather than leads the breast change.
Axillary hair tends to appear even a bit later than pubic hair, once again after breast budding has already begun.
Breast budding, called thelarche, is driven by rising estrogen from the ovary and is the earliest visible sign that puberty has started in most girls.
Step 4: Final Answer:
The first evidence of pubertal development in a girl is the appearance of breast buds, option (A).