Ascientific theory
1)holds the highest level of acceptance
2)explains a number of facts
3)uses specific hypotheses and descriptive laws that have been well-tested
4)all of the above
5)none of the above

4)All of the above

Explanation:

A scientific theory is the detailed explanation for the cause of natural process, natural event occurring in the world. It can be tested on the basis of the experimental trials, and direct observations. Thus this holds the validity in results and accepted by the entire scientific community.

It holds the highest level of acceptance from all over the world and especially by the scientific communities. It also explains a number of facts those were unknown. The theory is supported by the descriptive laws and a hypothesis is created in before the actual generation of the theory so as to prove the facts experimentally.  

truck y has a greater velocity than truck x.