Options B, C and D are correct
By rounding to the nearest tenth, we are rounding to one decimal place
Hence, we shall be rounding each of the options to one decimal place to see which would give 2.8
To do any rounding, we shall consider the second digit after the decimal point
If the second digit is between 0 and 4, we round this to zero and the first number after the decimal point is not affected
If the secod digit after the decimal point is between 5-9, we round this to 1 and 1 to the number after the decimal point
Let us consider each of the options below;
a) 2.74
Rounding this to the neares tenth will give 2.7
This is not an answer
b) 2.84
Rounding 2.84 will give 2.8
This is an answer
c) 2.76
6 is greater than 4, so it would surely affect the first digit after the decimal
Rounding this will give 2.8
This is an answer
d) 2.805
rounding this will give 2.8
This is an answer
e) 2.86
rounding this will give 2.9
This is not an answer