Each sentence is labelled with a letter. From the given choices, choose the most logical order of sentences that constructs a coherent paragraph.

a. One of them copied and pasted large portions of the required text from a website.

b. Before assigning the project to his students, the guide gave a presentation on plagiarism.

c. The expulsion order that followed was not alarming.

d. A few students did not pay much heed to the consequences of the illegal act.