The Sharda Act of 1930 was introduced with the objective of discouraging child marriages in India. The act aimed to raise the minimum age for marriage for both boys and girls.

Option 1 states that the act discouraged marriages of boys at the age of 21 and girls at the age of 18. However, this is incorrect as the act aimed to increase the minimum age for marriage, not lower it.

Option 2 suggests that the act discouraged marriages of boys at the age of 18 and girls at the age of 16. Again, this is incorrect as the act aimed to raise the minimum age for marriage.

Option 4 states that the act discouraged marriages of boys at the age of 16 and girls at the age of 14. However, this is also incorrect as the minimum age for marriage for girls under the Sharda Act of 1930 was 18, not 14.

Therefore, the correct answer is option 3, which states that the Sharda Act of 1930 discouraged marriages of boys at the age of 18 and girls at the age of 14. This aligns with the objective of the act to raise the minimum age for marriage and discourage child marriages.

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