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What is minimum cement content for concrete permanently under sea water to avoid the corrosion of reinforcement?

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What is minimum cement content for concrete permanently under sea water to avoid the corrosion of reinforcement?

(a) 5 kN/m^3

(b) 5 N/m^3

(c) 3 kN/m^3

(d) 3 N/m^3

The question was posed to me in final exam.

The origin of the question is Cement Concrete Construction topic in portion Cement Concrete Construction of Construction & Building Materials

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The correct option is (c) 3 kN/m^3

Easy explanation: However it is not advisable to take the risk of corrosion of reinforcement for prestressed concrete and hence the seawater should not be used for making the prestressed concrete.

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