Find out whether there is any grammatical error in below sentence. Reasonable ambition, if supported / at persistent efforts, / is likely to yield / the desired results.

Reasonable ambition, if supported
at persistent efforts,
is likely to yield
the desired results E. No error

The correct answer is E. No error.

The sentence is grammatically correct. The word “at” is used to indicate a time or place, but it is not necessary in this sentence. The word “is” is used to connect the subject and predicate of the sentence, and the word “likely” is used to express a possibility. The word “to yield” means to produce or give something, and the word “the desired results” refers to the outcome that is hoped for.

The sentence is clear and concise, and it conveys the intended meaning. There is no error in grammar, punctuation, or spelling.