Read the following statements: Assertion (A) and Reason (R). Choose the correct alternative from those given below:
Assertion (A): The maximum value of Marginal Propensity to Save (MPS) can be unity.
Reason (R): At the break-even level of income, savings are zero.
Assertion (A): This is true because theoretically, MPS could reach unity if all additional income is saved, but practically, this is rare.
Reason (R): This is also true since, at the break-even level of income, consumption equals income, leaving savings at zero.
Conclusion: While both statements are true, Reason (R) does not correctly explain Assertion (A) since break-even income concerns savings at zero, not the maximum possible value of MPS.

Study the given molecular structure of double-stranded polynucleotide chain of DNA and answer the questions that follow. 
(a) How many phosphodiester bonds are present in the given double-stranded polynucleotide chain?
(b) How many base pairs are there in each helical turn of double helix structure of DNA? Also write the distance between a base pair in a helix.
(c) In addition to H-bonds, what confers additional stability to the helical structure of DNA?

Draw a rough sketch for the curve $y = 2 + |x + 1|$. Using integration, find the area of the region bounded by the curve $y = 2 + |x + 1|$, $x = -4$, $x = 3$, and $y = 0$.