Percentage yield of the reaction?

Question

For a combination reaction, it was calculated that 8.0g of A would exactly react with 3.5g of B. These amounts were reacted, and 10.5g of product was isolated. What is the percentage yield of the reaction?

Choices:

Cannot be calculated

100%

91%

76%

33%

Answer 1

first of all 10.5g of A or B  or both A&B of product was isolated?

Answer 2

91 %.

If 3,5 g react exactly with 8 g, the product mass expected is the sum (100 %). 10,5 g is 91 % of 11,5 g.

Answer 3

86,96%

sorry 91%