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Sir William Mills, the inventor of both the Mills bomb, the most widely hand grenade most widely used by British Imperial forces during the First World War, and also of the Metallic Golfing Instrument Head, possibly the first aluminum golf club, was known as an innovative world-renowned inventor.
a. also of the Metallic Golfing Instrument Head, possibly the first aluminum golf club, was known as an innovative world-renowned inventor
b. also the Metallic Golfing Instrument Head, possibly the first aluminum golf club, was known as an innovative world-renowned inventor
c. of the Metallic Golfing Instrument Head, which possibly was the first aluminum golf club, was a world-renowned inventor
d. of the Metallic Golfing Instrument Head, possibly the first aluminum golf club, was known as a world-renowned inventor
e. the Metallic Golfing Instrument Head, possibly the first aluminum golf club, was a world-renowned inventor
Official Explanation
Creating a filter: as we're reading through the prompt, there seem to be an awful lot of modifying phrases set off by commas, but we may not see a definitive error.
Finding objective defects: as we compare answer choices, we can notice that a key choice is whether we start with the word "of," "also," or "also of." The answer to that question is determined by the prior phrase, near the beginning of the sentence, "inventor of both the Mills bomb..." To finish that off that "both," we need an "and," which we get before the underlined portion. "Also" is redundant. And the word "of" is not permitted, because the first "of" comes before "both."
That leaves only one possibility: the correct answer is (E).