单项选择题

These studies will yield valuable lemons ________.
A) in which to save lives and protect property
B) how to save lives and protect property
C) in how to save lives and protect property
D) about those to save lives and protect property

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经营许可证号：湘B2-20140064

These studies will yield valuable lemons ________.A) in which to save lives and protect propertyB) how to save lives and protect propertyC) in how to save lives and protect propertyD) about those to save lives and protect property