Question
With the growing demand for electric vehicles, (1) /
automakers are investing heavily (2) / on research and development (3)/ to improve battery technology.(4) Read the sentence to find out whether there is any grammatical or idiomatic error in it. The error, if any, will be in one part of the sentence. The letter of that part is the answer. If there is ‘No error’, the answer is (5). (Ignore errors of punctuation, if any).Solution
Use "in" instead of "on" in the phrase "investing in research and development."
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