Answer :
Let [tex]$x$[/tex] represent the age of building [tex]$C$[/tex]. According to the problem:
1. Building [tex]$B$[/tex] was built two years before building [tex]$C$[/tex]. Therefore, the age of building [tex]$B$[/tex] is
[tex]$$x + 2.$$[/tex]
2. Building [tex]$D$[/tex] was built two years before building [tex]$B$[/tex]. Thus, the age of building [tex]$D$[/tex] is
[tex]$$(x + 2) + 2 = x + 4.$$[/tex]
3. The product of the ages of buildings [tex]$B$[/tex] and [tex]$D$[/tex] is at least 195. This gives the inequality:
[tex]$$ (x + 2)(x + 4) \geq 195. $$[/tex]
4. Expanding the left-hand side, we have:
[tex]\[
(x + 2)(x + 4) = x^2 + 4x + 2x + 8 = x^2 + 6x + 8.
\][/tex]
So, the inequality becomes:
[tex]$$ x^2 + 6x + 8 \geq 195. $$[/tex]
5. This expression matches option B.
Thus, the correct answer is:
[tex]$$\boxed{x^2 + 6x + 8 \geq 195.}$$[/tex]
1. Building [tex]$B$[/tex] was built two years before building [tex]$C$[/tex]. Therefore, the age of building [tex]$B$[/tex] is
[tex]$$x + 2.$$[/tex]
2. Building [tex]$D$[/tex] was built two years before building [tex]$B$[/tex]. Thus, the age of building [tex]$D$[/tex] is
[tex]$$(x + 2) + 2 = x + 4.$$[/tex]
3. The product of the ages of buildings [tex]$B$[/tex] and [tex]$D$[/tex] is at least 195. This gives the inequality:
[tex]$$ (x + 2)(x + 4) \geq 195. $$[/tex]
4. Expanding the left-hand side, we have:
[tex]\[
(x + 2)(x + 4) = x^2 + 4x + 2x + 8 = x^2 + 6x + 8.
\][/tex]
So, the inequality becomes:
[tex]$$ x^2 + 6x + 8 \geq 195. $$[/tex]
5. This expression matches option B.
Thus, the correct answer is:
[tex]$$\boxed{x^2 + 6x + 8 \geq 195.}$$[/tex]