Which house most likely flooded as a result of the storm ?
a. y only
b. x and z
c. x only
d. y and z

D. look at table 1 and look at the water level then look at table 2 and it's pretty easy from there.

D. Y and Z

Explanation:

From the data given, one can easily see that the maximum elevation achieved by river is  5.2 meters. Now the house Y has the elevation of 3.5 meter and house Z has elevation of 4 meters. Around 1:00 PM, when the flood level reaches at 4.0 meters, both Y and Z houses will be flooded badly. Since, House X has an elevation of 8 meters so it is completely safe. So option b and c are excluded.

Since, elevation of river would be higher than both Y and Z, so option a is also excluded and option d is the right answer.

he is very short, and he can only reach halfway up on the elevator buttons. but on a rainy day, he has his umbrella with him, and he uses it to poke the button at the top.