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The question has a set of four statements. Each statement has three segments. Choose the alternative where the third segment in the statement can be logically deduced using both the preceding two, but not just from one of them.

1. All earthquakes cause havoc. Some landslides cause havoc. Some earthquakes cause landslides.
2. All glass things are transparent. Some curios are glass things. Some curios are transparent.
3. All clay objects are brittle. All XY are clay objects. Some XY are brittle.
4. No criminal is a patriot. Ram is not a patriot. Ram is a criminal.
1. D only
2. B only
3. C and B
4. A only

from deduction rules (http://aptitude.gateoverflow.in/2346/cat1999-125#a2370)

$\text{Option (A)}:$

1. All earthquakes cause havoc.
2. 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 $\textbf{it is false}$

$\text{Option (B)}:$

1. All glass things are transparent.
2. Some curios are glass things.

Given conclusion : Some curios are transparent. $\textbf{which is correct,}$ it does not violate any rule .

$\text{Option (C)}:$

1. All clay objects are brittle.
2. All XY are clay objects.

Given conclusion : Some XY are brittle. $\textbf{which is correct,}$ follow all rules.

$\text{Option (D)}:$

1. No criminal is a patriot
2.  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.

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