Concept:Each term (1+n1) simplifies to nn+1. Multiplying them creates a telescoping product where most numerators and denominators cancel.Explanation:Rewrite every factor: (1+31)=34, (1+41)=45, …, (1+981)=9899.The product becomes 34×45×56×⋯×9899.Notice each denominator cancels with the numerator of the next term, except the first denominator 3 and the last numerator 99.After cancellation, only 399=33 remains.Answer:33 (Option C)