7. Consider the following statements:
1.The most important factor that determines the strength of concrete is the water-cement ratio.
2.Consistency, rate of curing, and durability of asphalt cements are important considerations for their use in pavements.
3.Creep is a high-temperature deformation failure mechanism.
4.During the cement production process, gypsum is added to retard the setting time of cement.
5.Concrete is very strong in tension; however, it is very weak in compression. Reinforcing steel is, therefore, embedded at strategic locations in concrete members to take the compressive stresses.
Which of the following statements is true?
A. 1.
B. 1,2,3.
C. 1,2,3,4.
D. 2,3,4,5.