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). The vehicles are expecting to assist Fiat Chrysler in meeting U.S. fuel economy standards and help in reshaping the brand’s gas-guzzling SUV image.

The phrase "The vehicles are expecting to assist" is grammatically incorrect.  Expecting (active voice), implies that the subject has an expectation. (Incorrect for inanimate objects like "vehicles."). on the other hand, expected (passive voice), indicates that someone else anticipates something about the subject, which is appropriate for inanimate objects. Hence, 'expecting' should be replaced by 'expected' to make the sentence grammatically and contextually correct. Corrected Sentence:"The vehicles are expected to assist Fiat Chrysler in meeting U.S. fuel economy standards and help in reshaping the brand’s gas-guzzling SUV image."