Use a when you are unable to ask every member of the population. a. strategy b. sample c. process d. census

B. sample is the correct answer.

If you cannot ask every member of the population, you should ask a handful of them instead which represent the entire population. This is called a sample.

(A) SSS Postulate

Step-by-step explanation:

Given: AB≅DC and AC≅DB.

To prove: ΔABC is congruent to ΔDCB.

Proof: It is given that AB≅DC and AC≅DB, thus let us consider  ΔABC and ΔDCB, then

AB≅DC (Given)

AC≅DB (Given)

BC=BC (Reflexive property of congruence)

Thus, by SSS rule of congruency, ΔABC is congruent to ΔDCB that is ΔABC≅ΔDCB.

Hence, option A is correct.