Which of these sentences is correctly written?
a) when reaching the secret chamber in the left wing, leaning against a beam to recover his breath, and praying that he might find what he needed.
b) when reaching the secret chamber in the left wing, he leaned against a beam to recover his breath, he prayed that he might find what he needed.
c) on reaching the secret chamber in the left wing, leaning against a beam to recover his breath praying that he might find what he needed.
d) on reaching the secret chamber in the left wing, he leaned against a beam to recover his breath and prayed that he might find what he needed.

cabeza de vaca was an spanish explorer and n his long exploration of 11,000.km. from florida to present-day mexico, he went through a series of calamities and setbacks that only added to his deeds. he applied his religious creed with the humanist idea, always current and universal, that all men were equal before god and destiny without any discrimination. as an explorer, he became a slave to the tipinoga, then his shaman pointer, later and after an operation of heart to an indian (from which both came alive) he achieved stardom and became a hero followed by a crowd that professed unusual respect and admiration.

i think its d, but grammarly says none

explanation: