From an early age, ernest shackleton was drawn to the sea. (1) while he loved to read because it fueled his appetite for adventure, he was often bored in school. his father, a doctor, wanted ernest to pursue medicine, but he accepted the boy’s restless nature and allowed him to join a southbound ship’s crew when he was sixteen. (2) his first experience at sea in 1890 was a difficult one, but shackleton wasn’t discouraged. in fact, he dreamed of going even farther south to mysterious antarctica. (3) by age twenty-four, shackleton had qualified to be a ship’s commander. in 1899, he learned that the royal geographical society was organizing an expedition to the antarctic. he volunteered for the venture, led by robert falcon scott, and sailed on the discovery expedition; however, midway through the trip he became ill and was sent home, much to his disappointment. (4) shackleton was an only child and had no pets as a boy.
which sentence is not relevant to the paragraph and should be deleted?
a) sentence 1
b) sentence 2
c) sentence 3
d) sentence 4