A benevolent social planner would prefer that the output of good x be decreased from its current level if, at the current level of output of good x, a. social cost = private cost = private value < social value. b. private cost < social cost = private value = social value. c. social value = private value = private cost < social cost. d. social cost = private cost = private value = social value.

the correct answer would be b, when, queen, calder hall and london.

explanation:

we always capitalize words when a paragraph or sentence is starting, when an important name is used, when a place is being written, or simply when a noun is used, etc. so in this sentence, sentence is starting from 'when', so it will be written in capital letters. secondly, queen is considered to be an important person, so it will also be written in capital letter. next, the name of the town is mentioned, i-e calder hall, which will also be written in capital letters. in the last,   city name is being used, 'london', which will also be written in capital letters. so option b is the most appropriate one.

(75years ,i believe is the correct answer.good luck

it is d i just took the test

b is the correct answer