The correct answer is A . In a 2-for-1 stock split , each existing share is divided into two shares. Immediately following the mechanical adjustment, the shareholder owns twice as many shares, while the price per share is approximately halved. Consequently, neither the investor's proportional ownership interest nor the aggregate market value of the position changes solely because of the split.

The Canada Revenue Agency explains the effect directly: in a 2-for-1 split, the number of shares doubles and the price per share decreases by 50% . Its example shows 100 shares at $60 becoming 200 shares at $30, leaving the total holding worth $6,000 in either case.

For tax purposes, the shareholder's total adjusted cost base is likewise spread across the larger number of shares. Thus, if an investor's total ACB was $1,000 before the split, that total does not become $2,000 merely because the number of shares doubles; instead, the ACB per share falls proportionately .

B and C incorrectly treat additional shares as newly created economic wealth. D reverses the effect because the proportional price adjustment means that company market capitalization does not automatically shrink.

Study Guide Reference: CIRE Element 7 — equities, share characteristics and corporate actions; Canadian tax treatment of stock splits and consolidations.

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