The correct answer is: Only argument I is strong.
Argument I is strong because it is based on evidence that sex determination tests lead to female foeticide. This evidence is supported by studies that have shown that the sex ratio at birth has declined in countries where sex determination tests are widely available.
Argument II is weak because it is based on the assumption that people have a right to know about their unborn child. However, this right is not absolute and must be balanced against the harm that sex determination tests can cause.
In conclusion, only argument I is strong.