from deduction rules (http://aptitude.gateoverflow.in/2346/cat1999-125#a2370)
$\text{Option (A)}:$
- All earthquakes cause havoc.
- Some landslides cause havoc.
Given conclusion : "Some earthquakes cause landslides." there is no conclusion , becoz middle term " havoc" in both the premises is not distributed which $\text{violate rule 2.}$ so $ \textbf{it is false}$
$\text{Option (B)}:$
- All glass things are transparent.
- Some curios are glass things.
Given conclusion : Some curios are transparent. $\textbf{which is correct,}$ it does not violate any rule .
$\text{Option (C)}:$
- All clay objects are brittle.
- All XY are clay objects.
Given conclusion : Some XY are brittle. $\textbf{which is correct,}$ follow all rules.
$\text{Option (D)}:$
- No criminal is a patriot
- Ram is not a patriot
Given conclusion : Ram is a criminal. , here no conclusion exist , becoz if both premises are negative , then no conclusion according to rule 5) so $\textbf{it’s not correct.}$
hence B and C is correct so option $(3)$ is correct.