Which expression shows a sum of three terms?

A. x3

B. 3 + x + 3

C. 3x

D. 3 (x + 3)

And just wanted to ask how is everyone?

x + 3 + x

Step-by-step explanation:

Step-by-step explanation:

The sum of three terms means that three terms have been added.

3x is the answer; it does not show the terms being added.

3+x is the sum of two terms.

x³ is a product.

x+3+x shows 3 things being added, so it is the correct answer.