Explain why the phrase “the laws of natures and nature’s God” was included in the Declaration of Independence.

Explanation: Quick explanation.  The "laws of nature and of nature's God" entitle the United States to independence. Men are "endowed by their Creator with certain unalienable rights." And the Declaration of Independence contains a theological teaching because the ultimate source of our rights and duties is God.

classical republicanism, also known as civic humanism, is a form of republicanism  developed in the renaissance inspired by the governmental forms and writings of  classical  antiquity, especially such  classical  writers as aristotle, polybius, and cicero.

i would say b. research typically uses a variety of sources