A) This could be true. However, it does not affect the argument that "universities must increase their efforts to gain more students in the field of computer engineering". Out.
B) This also could be true, but like A, does not impact the argument. So what if bio engineering has many new job positions available? This is more of an explanation as to why bio has become more popular, rather than a weakening statement. Out.
C) C is, in my opinion, quite difficult to eliminate. What C implies is that, because many students will want to work in the computer industry (since it is one of the largest), then the university does not have to do anything to increase the number of engineering students, since many students will apply to go and work in that industry. However, the issue is that no information is given on where students want to work. It is not known if students actually want to work in the computer industry - it is only given that it is the largest industry. It could very well be that no one wants to work there for other factors. If that is the case, then C does not help the argument at all, and if anything it strengthens it. So C is out.
D) This is the correct choice. If we consider a case where, even if bio-tech engineering became super popular, there are many more students applying to both courses, the univeristy might not need to increase its efforts to gain more students in the field of engineering, because more students would join as a result of the increased number of applications.
To better illustrate D:
Suppose we had a case where 100 students apply, and 70 went to engineering and 30 went to biotech. Now lets say next year 1000 students apply, 500 went to biotech (as it is now more popular, 50% of applicants vs 30%) and 500 went to engineering. Does the university really have to do anything, as the argument states? Not necessarily. The author has made the assumption that the total number of students would remain the same, and that there would be less people applying to engineering. D shows that this not the case.
E) Completely irrelevant to the argument. Out.
Final Answer D.