Let p, q, r and s be natural numbers such that
p - 2016 = q + 2017 = r - 2018 = s + 2019
Which one of the following is the largest natural number?

Correct Option: (d) s

Let p - 2016 = q + 2017 = r - 2018 = s + 2019 = k (where k is a constant). Then we can express each variable in terms of k: p = k + 2016, q = k - 2017, r = k + 2018, s = k - 2019. Comparing the values for any given integer k: p is k plus 2016, q is k minus 2017, r is k plus 2018, and s is k minus 2019. Wait! Let's re-verify carefully: If p - 2016 = k, then p = k + 2016. If q + 2017 = k, then q = k - 2017. If r - 2018 = k, then r = k + 2018. If s + 2019 = k, then s = k - 2019. Clearly, r has the largest added value (+2018), making r the largest natural number. Wait, let's check option (c) which corresponds to r. Let's double check: if p - 2016 = q + 2017, then p = q + 4033, so p > q. If p - 2016 = r - 2018, then r = p + 2, so r > p. If r - 2018 = s + 2019, then r = s + 4037, so r > s. Thus r is unequivocally the largest natural number.