Answer:
(B) Muller’s career began in an unpromising apprenticeship as
Explanation:
Participial phrases, which acts as opening modifiers, should be followed by the noun they are modifying. This mistake is obvious in A and D.
In option C, “being” is used as an unfitting and awkward modifier which is not correct in the GMAT (however other uses of “being” is allowable).
Option E commits an error of verb tenses which is demonstrated in the tip below.
When a perfect tense is being used, it is appropriate to picture a tense timeline. We are aware that the past perfect must have happened for a time before the simple past (which has to be present in the sentence) and present perfect ought to have started prior to the simple present.