princeann
How do we know if Muller's career has ended? maybe his career is still ongoing? Then, a present perfect tense is acceptable? is there any other mistake in E
If we were saying something about his career
in general, present perfect might be okay (e.g. "Spanning more than 50 years, Muller's career has been very impressive.")
But the sentence specifically talks about the
beginning of his career. Even if his career were still in progress, "has begun" wouldn't make sense because his 50-year career clearly isn't still in the process of
beginning. In other words, even if his career is still in progress, the action of "beginning" is certainly over -- he's been working for over five decades!
The simple past ("began") makes a lot more sense. Also, as already mentioned elsewhere in the thread, sticking "the career of" in between his first and last names doesn't work, so (E) has to go.
I hope that helps!