Hi
akshaymalpani,
In the minds of many scientists and
although Harrison Ford more famously played Han Solo and Indiana Jones are two non essential modifiers and they both modify the main clause "
his most memorable role was Rick Deckard".
You can notice that by asking yourself
"
which was Harrison Ford's most memorable role?" --> "It was Rick Deckard
in the minds of many scientists".
Here
in the minds of many scientists represents an adverbial modifier, which can modify adjectives, verbs, or even clauses.
When there are more than one non essential modifiers it becomes difficult to spot them and to put them in the correct position. Non essential modifiers have to be as close as possible to the object they modify. In the answer choices, every modifier is put in the right position.
Nonetheless, there are a bunch of errors that one may notice:
B/C are out as they both imply that Harrison Ford changed identity. In fact, he just played a different role in different films (we have a meaning issue)
E uses the pronoun
he without any antecedent, and answer A solves the ambiguity by putting the actual name
Harrison Ford at first.
D incorrectly uses the past perfect, which conveys a totally different meaning to the actual sentence.
Finally, A does eliminate the problem of ambiguity and correctly uses the past tense form.
Hope it helps!