I would go with <em>b. more efficient ships</em>.
Mechanical motors were very helpful, they helped the ship move, but I don't believe they were the development that aided the explorers the most.
Sure, they could've made maps, but what was the point? If they already knew the layout of the oceans and lands, then they could've easily traveled wherever they pleased without trouble. This also applies for the spherical globe.
A greater supply of efficient ships helped sailers get by tougher tides and harsher weathers. Ships were produced to be better, stronger, and more durable. They were able to handle more weight and carry more passengers.
Furthermore, the production of efficient ships were the development that most aided explorers in their ability to sail the oceans to discover the New World during the Age of Discovery.
(This is all from my logic. I've not read your lesson, therefore, I do not truly know the answer other than using my common sense.)
Hopefully, this helps.
Grazing contentedly in the pasture is the dream of every cow.
Grazing contentedly in the pasture is to chew grass happily in the grass meadow.
N AfD election poster in Berlin says "Stop Islamisation"
The nationalist Alternative for Germany (AfD) has grown rapidly since it was formed in 2013 and is now the biggest opposition party in the Bundestag (national parliament), with 89 seats.
Founded in 2013 as an anti-euro party, it has shifted its focus to immigration and Islam and is increasingly seen as far-right in tone.
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Is it far-right?
Yes. It may not have started out as a far-right party but it soon embraced far-right policies and many of its leaders have espoused far-right rhetoric.
AfD co-chairman Alexander Alexander Gauland has talked of fighting an "invasion of foreigners" and the party openly focuses on Islam and migration, seeing Islam as alien to German society. Some of the party's rhetoric has been tinged with Nazi overtones.
The AfD sits in the same political family as France's far-right National Front and Austria's far-right Freedom Party - as well as the populist, anti-Islam Dutch Freedom Party (PVV) of Geert Wilders. Nigel Farage, former leader of the UK's anti-EU party Ukip, took part in their 2017 election campaign.
