Can someone tell me why this answer is correct?

in a nickel-cadmium dry cell, which of the following statements is true?

the cathode reaction is cd + 2oh- (arrow) cd(oh)2 + 2e-

the anode reaction is nio2 + h2o + 2e- (arrow) ni(oh)2 + 2oh-

the cathode reaction is cd + nio2 + 2h2o (arrow) cd(oh)2 + ni(oh)2.

explanation:

venn diagram is pictorial representation with of circles showing the relation between two finite sets or things. the intersection part of two circles conveys the relation present in between those sets or things.

here in the venn diagram of sand and salt two circles represent sand and salt. but the area falling under the intersection of these circle represents the mixture of sand and salt.

so, in a venn diagram the mixture will be placed in a middle that is in between the intersection of two circles.

im not exactly sure but i think its b!