A. Solar eclipse
B. Lunar eclipse
C. earthquake
D. heavy rain

Submitted by: Neelam Parri

Namaz-e-Kasoof (نماز کسوف) is offered at the time of solar eclipse.  

and

Namaz-e-Khasoof (نماز خسوف) is offered at the time of Lunar eclipse

solar eclipse:
A solar eclipse occurs when the Moon passes between Earth and the Sun, thereby totally or partly obscuring the Sun for a viewer on Earth.

Lunar eclipse:
A lunar eclipse occurs when the Moon passes directly behind Earth and into its shadow. This can occur only when the Sun, Earth, and Moon are exactly or very closely aligned, with Earth between the other two. A lunar eclipse can occur only on the night of a full moon.